Asking for an upgrade is different from handing over 20$ for great service. I hope its industry standard that when a customer tips an attendant they upgrade the room. And the only reason I said..."I was hoping for a complimentary upgrade" was because I read LuvEurope's post...see below. "Thought I would add my 2 cents here on how to get a better room, 1-make sure you get a Hilton Honors card (apply online if you have time before you go) Let the check in person see that you have one, you wont get any miles, but it makes you seem like a Hilton regular. I dont know how many days you will be staying but I learned from Travelguy on this board about the $20.00 check in trick. Last month while in FL I asked for an upgrade to a suite/better room. I had a $20 on top on my check- in credit card. When the front desk person told me that the suite/room would be another $65 per night, I said nicely that I was hoping for a "complementary" upgrade and sort of looked at the $20. She whispered that she would she want she could do, and lo and behold upgraded me for all 3 nights. I thanked her for all her effort and quietly gave her the $20. Well spent $20 in my view. I never would have done this before and I have been traveling for many years. I told my friend who worked at the Ritz Cartlon front desk a long time ago about this and she laughed and said thats how they made all their money and were thrilled when people wanted to tip them. Have a great time in "the City"