Hi puerto rico fan,
Welcome to the forums, as you didn't say where you have stayed before I will try to place the casablanca apartments. The casablanca apartments were before called "Alvatur" when they changed management about 2 years ago they changed the name aswell.
They are situated in the same street as the Calador - Calanova, and they are situated between Castillo del Sol and Carlota, two big set of stairs and you are in the shopping center, they look so much better now when you drive past i haven't been inside but the outside looks more than apartments like a hotel or something.
Here is the website of the new management
http://www.servatur.com/