The Sheraton Puerto Rico Hotel is a beautiful property with attentive and friendly staff. It has a concierge lounge that is open to SPG Platinum members. The lounge is on the 12th (top) floor and is lovely. It has both inside and outside seating areas. The lounge food, especially breakfast, leaves much to be desired though. SPG Platinum guests are treated well...I was placed in a very nice room on the top floor.
The problem with this hotel is its location. You must have a car to get anywhere interesting. On my previous trip to Puerto Rico I stayed at the La Concha Renaissance San Juan Resort which is on the ocean in the Condado neighborhood. The location made all the difference. It was so nice to be able to be on the beach, and to be located close to numerous restaurants and shopping. At the Sheraton, on the other hand, the only walkable attractions are the convention center and the restaurants and casino at the hotel itself.