BEWARE of the car rental company that the hotel cooperates with!!!

It is named Stars Cars and has a 2.3-star rating on Google, which we only discovered when it was too late. We relied on the hotel, which was a mistake.

When the guy brought the car, he told us, we were "upgraded" to a higher class. While we didn't want an upgrade cause the streets are small and we explicitly decided to go with a smaller car, we were shocked with what he brought. It was a ~10 years old Opel Insignia with 144.000km, scratched and damaged from each angle, dirty, defect motor sign, etc. It is a nightmare!
However, it was late and we needed the car, so after some discussion we accepted soured.

Then the guy tried to rip us 4-times:
1) the price was 50% higher than in the pricelist before, as he calculated the days differently, we managed to clear this and he said "oh, sorry, I was wrong..."
2) When I said we need no insurance as I have full coverage on the credit card, he requested 900€ blocking on the credit card which would be released eventually 2-3 weeks after our rental. This we couldn't negotiate with him. He said he cannot trust a customer. I said I cannot trust him. This is where the discussion ended.
3) the price of the insurance, which he pressed us at 2), was double the real rate, we also managed to clear this and he didn't even comment on it4) he didn't want to mark the damages on the booking form, said he has not enough time for checking the cars damages, but we just marked the whole car around and it was ok for him
An absolute nightmare, I never experienced such a bad rental car service anywhere I've ever been.