I have been coming to Pittsburgh for quite a while, and knew this location as the Vista before being taken over by the Westin. This is also the location for all the visiting teams coming into Pittsburgh for the football and baseball games there.
When they took over, they added the "Heavenly beds" (big beds with pillow tops and great duvets) and "heavenly showers" (which have the bowed shower curtain to give you more room). The trick we learned was to get to the room, turn on the airconditioning, and when you get back get under the duvet. It is great.
The staff here is great too. The doorman will also arrange a limo for your transportation around downtown if you play your cards right.
The restaurant there (Fish Company) is OK, and the bar is great.