Loved it!  Our room overlooked the river and Market Square.  It was very comfortable and extremely well-outfitted.  The service at this hotel is outstanding - not only was the service prompt and helpful, but friendly as well.  The location is great - we were able to walk to both the baseball and hockey stadiums, as well as the river and many restaurants.  The Fairmont boasts a top notch fitness center, an upscale bar, and good room service (although I can only vouch for the room service for continental breakfast).   We valet-parked our car upon arrival and it was promptly returned to us upon check out.  Visiting Pittsburgh?  Stay here.