Had a lovely stay at the Sheraton. My room was large, clean and modern. The beds were very comfortable. The one downside is you have to pay for internet in your room which is a pet peeve of mine when you pay this much for a room.
The lobby is beautiful, lots of places to relax, grab a coffee etc. The gym has fantastic cardio machines but definitely too few. I was there at 7:30am and grabbed the last treadmill. So be prepared to wait or go during off hours if you're looking to run.
Overall a nice place to stay in downtown Phoenix.