At Westin Warsaw now. Ur post makes me want to have tried the Sheraton. But a few comments abt the lounge:
#1 best thing: fresh OJ, 24x7, unless the run out.
#2: Chivas during happy hour.
#3: view.
#4: soups: (only good food, but pretty good).
If Sheraton has fresh OJ 24x7, I think i'd switch because my recollection is that the food at breakfast and happy hour is better.