I stayed at the Renaissance on a recent business trip and I was impressed by the hotel. The staff was super friendly and I was pleasantly surprised that there's a signature cocktail served every evening at 6pm. Whatever cocktail I had tasted just ok but hey, it was free!
The standard room was a good size and had everything I needed. The only downside is that the Internet was so slow. I had to take a quiz via email for class and I almost wasn't able to send it back to my professor in time because I had trouble sending the attachment.
The gym was really nice for a hotel. The cardio machines are hybrid, which I thought was really cool. Apparently, my pedaling of the elliptical saved several minutes of electricity. It was also open 24 hours a day for the convenience of guests. I would certainly stay at the Renaissance again if I an ever in Phoenix again.