We rented from Sixt in Israel last summer and I have to say while they're not the most high end agency they provided great service. Our van had an overheating problem...it was 100 F outside normally so it's pseudo understandable since we were driving in the mountains. We returned that van and were given a bigger-nicer van, a free tank of gas and 1 day credit for our problems. the switch took about 20 minutes.
We didn't have a fuel charge problem even though we did return it a little less full than required.

From the Lufthansa website:
Your arrival
The special First Class Service starts right away when you arrive at the First Class Terminal Frankfurt. The parking of your car or the return of your rental car will be done for you by Sixt Valet Service. And naturally we will also make sure that your baggage is forwarded.

http://www.lufthansa.com/it/en/First-Class-Terminal-Frankfurt?blt_p=IT&blt_l=en&blt_t=Info_and_Service s>At_the_Airport&blt_e=Content&blt_n=Related%20top ics&blt_z=First%20Class%20Terminal&blt_c=IT%7Cen%7 CInfo_and_Services%3EAt_the_Airport%7CContent%7CRe lated%20topics%7CFirst%20Class%20Terminal

Thats quite cool - will definitely have to use FCT one day.

With Sixt, we have had one good experience, and one very bad experience. Both times we picked up cars in Munich Stachus. The garage is very dark and it is virtually impossible to inspect the auto. The first time we received a Mercedes E-class with damage, that was noted on the paper. We returned the car to the same garage, no problems.....

Second time, we rented a BMW 3er (or Mercedes C-Klasse). When we went in they only had one auto available and said they were upgrading us to a BMW X5 Diesel. (This car is so large I wouldn't even drive it, my husband did!) They insisted it was the only auto that they had available for us and we took it. When we got it back to the apartment we garaged in (in a private garage) and only used the car for two trips: Friedrichshafen and Berchtesgaden. No accidents or problems. When returning it to the Munich airport, they recorded scratches that were previously there. We asked if there were any problems as we had noticed the scratches, and were told no problems (kein problem). Two months later we received a bill for 1300 Euro's! Needless to say, we turned the claim over to AMEX whom we have insurance through and they are going to take care of it.

Previously I would have recommended SIXT, but at this time I cannot. If you rent through them I would have to recommend that you use a credit card that you have purchased additional insurance through. At this point, I am very disappointed with the service that was provided at the Munich Airport. In addition, we believe that they put us in this car knowing the condition of the car with the scratches.

I had an interesting experience myself on a MUC -> FRA rental. In MUC the car was damaged ... which you find after a 5 minutes walk. So 5 minutes back to the desk so that you can walk back to the car and wait around 10 minutes for the damage guy. The damage guy tells you "oh in Frankfurt they dont care about it...." I said F%# that and spent ten minutes pointing out the most minute scratches.

Of course in frankfurt they pulled out the microscopes when they checked me in and spent ten minutes scrutinizing the car luckily they found nothing interesting.

Now for OP this is the funny part - funny from my perspective of renting in the US where you get a receipt from their handheld and email. I asked for a receipt since I wanted something saying everything is ok and no further charge. The guy told me he cannot do this I should go to the office and pointed me to it. Since I had a lot of time before my flight I said oh what the hell. And there in the garage there is an office that all the rental companies share where they give you a letter in German confirming that you returned the car... not a receipt. If you want a receipt you have to walk 15 minutes to the actual sixt desk and give them the confirmation that you returned the car.... I thought Germany was supposed to be a modern country

Either MUC stations are reckless or they cheating customers on a purpose. There are not a lot of posts about Sixt here on FT, but you are not alone saying you was supplied a car in MUC with unreported damage.

Could be interesting if Customer Protection or German Police would take care to investigate this. Any German local care to make an inquery?

well, I virtually always take 5 minutes when taking over a car to check the car on damages on every detail.
I nearly find an unreported damage, sometimes a small scratch or dent, sometimes larger damages.

This is regardlas of city or station.

I sometimes am more than surprised what kind of big bumper damages or similar are not filed.
I guess this often happens when the car is returned to stations where the staff is in a hurry and takes less than a minute to check-in the car and therefore miss some damages.

Once again: just make sure that you check the car properly before leaving the station and let the found damages write in your contract.
I�t�s sufficiant to write down the damage on your contract print out, add the name of the SIXT employe who files this new detail and have him sign this.

No, I don�t think SIXT tries to trick you into a high invoice due to unfiled damages, still it�s very annoying that you can�t trust the reported damages on the paperworks.

That�s due to unefficient systems in FRA, but is the fact for all rental companies here, as the car return is managed for all car hire companies by one sub-contractor called ARWE.
Actually, here in FRA my personal experience is VERY bad with ARWE-employees when returning.
I almost ever have any any surprises on my invoices if I don�t have the time to wait for a check-in report (charged fuel for returning not full- though this is wrong, additional day charged as the registered return time is sometimes several hours later than acutally returned...).
Last time they charged me for 5 days, though I just had the car for 1 day !!!

Fortunatelly all invoice-errors are corrected immediatelly when I contact SIXT customer service, but I really hate returning cars at FRA because of ARWE working quality.
This doesn�t mean that this is true for the SIXT-FRA staff, as they alsways treat me great.
Just for the recors: I have that kind of problems only when returning at FRA, so this makes me feel either they hate my guts there for whatever reasons or ARWE here is working like this on purpose.

I decided to give Sixt a try again this time in Italy-

After being bumped by Alitalia on a Naples-Palermo flight (due to arr PMO at 9pm) we were forced to spend the night at a crappy airport hotel and my mobile phone was dead and to be honest after the 3 hrs in Naples airport and grabing dinner, getting to the hotel, etc I could not call Sixt at PMO to let them know we will be there at 830am the next day (they closed at 10pm that night)
So we arrive PMO and I approach the counter and give her my name and she then starts to throw all kinds of attitude! She tells me she waited for 2 hrs til midnight for me and I should have called, blah blah blah......all my fault we were IDB from Alitalia
So after 5 minutes of going on she gives me the contract and I show her copy of the reservation with rates, etc and she staples them together and throws (I mean throws) us the keys.
Fast foward to return at Cantania....Sixt is the only company that does not have a return kiosk and I have to go search for the guy inside the office area to check the car in. I then follow him back to the office to confirm the total and he says its 486 Euro instead of my 386 Euro quote/res. He calls over to Palermo office and speaks to the agent and then tells me its a 100 euro surcharge because the agent waited for me the night before!!!!
What is the deal with Sixt Just my bad luck since I became Platnium

I handle proprotionally only a few complaints regarding the Customer Service in Italy, sure there are other things that go wrong like in any business but I think usually they must be quite charming. Not your experience though!! I will contact my colleagues regarding the service and charge if you could forward over some detail to [email protected]

Thanks Gary I just sent you an email

Hi,

I have responded to your e-mail.

I'm sorry that the service you received on this occasion was not up to our usually high standards.

I hope that you are happy with the documentation supplied and further detail in my e-mail to you.

Best regards
Gary

We recently rented/returned a vehicle to Sixt in Dublin. Filled up the car less than 1/2 mile from location. Sixt rep inspected the car, and said everything was in order.

A week later I see an additional charge on my card for $12. Not a huge amount but I inquired and they said it was for fuel. I indicated we topped the car right before dropping off. Here is the clever response:

"With most modern vehicles it is possible to drive a vehicle more than 100km (sic) without the fuel gauge reading full.

We have also noticed that a lot of petrol stations operate high volume pumps which can cause problems when refuelling As it can cause a vehicle to stop fuelling before it is actually full due to the speed it is filled at.

Perhaps this is what happened in your case?"

I demanded that they credit the amount back, or I would dispute the charge.
No response.

I am an AVIS Chairman's Club member, and I thought I would give SIXT a try, since they were more competitive on price. Never again. Coincidentally, the NY Times just did an article on "drip pricing" by airlines, rental agencies. In this case, it was literal.

For $12 seriously? I think there suggestion could very well be the case. $12 is less than 10 EUR. Given the price of fuel in the EU it is entirely likely.

Overcharged for an extra day at $60 plus. Returned car within one hour grace period, asked for confirmation that car was checked in on time as wanted to avoid any problems and told all is ok. Asked for a receipt. Looked at receipt and realized that incorrect time was indicated which would place us over the hour grace period. Requested that he correct same as both of our phones showed we were in time. After arguing with us (we were in garage for at least 10 minutes), he corrected receipt by hand. Still overcharged. Under facts, can only believe conduct is intended to incorrectly generate revenue.
After an otherwise good rental, leaves a bad taste.

Suzyrox