Hilton HHonors - Letter Good 4 Free Stay..What to Expect?

Ok, I have a new situation (at least to me):

After a particularly vile stay at a suburban Philly Hilton that shall be nameless for now back in March of 03, I received a phone call and subsequent letter from the Director of Housekeeping good for one night's stay, including tax. I will give you the abridged version:

" Dear Mr. NJRob,
Thank you for taking the time to share your concerns with me about the cleanliness of your room and the hotel....Your satisfaction and comfort is our first priority.
PLEASE PRESENT THIS LETTER UPON YOUR NEXT VISIT TO THE XXX AREA AND IT WILL BE VALID FOR A COMPLIMENTARY NIGHT'S STAY, INCLUDING TAX. PLEASE ACCEPT THIS AS A GESTURE OF APPRECIATION FOR YOUR COMMENTS.
Sincerely,
Mr. XYZ
Dir. of Housekeeping"

Ok, I have a reservation tonight, made via Hilton.com, with the notation very clearly in the comment box about this letter. Notice, there is NO EXPIRATION date on this too. What can I expect at the front desk? How about a stay credit, or at least credit for incidentals? I have in the past used a "Be MY Guest" Cert and gotten full stay credit and points, but never have used a letter such as this. Should be a fun time, eh? Anyone know what I can expect: battles, faxing of documents to Hhonors, or just enjoy my free room and eat/drink elsewhere.... :D ?

Thanks all....

Always try to have the hotel place your HH number in the reservation, then charge something to your room such as a drink, a movie, a newspaper etc. By doing so I have received HH credit for over half of the "free" stays given to me (the newspaper charge is my favorite).

MisterNice

Give your "favourite" hotel a call verifying your reservation and the fact you have this letter from your "favourite" hotel before check-in that can only be honoured by your "favourite" hotel. You know the obvious will happen if you don't. ^

When I have gotten these letters they have always had the AGM or GMs name on them asking that I call them direct to make my res.After I call and give them my HH # ,they make the res for me and I check it online.It aways says something about PMing the room before guest arrives and to give the guest a nice room or upgrade.Not sure about stay credit because I aways have a paid night with the free one.