The Bilbao flat was a great stay. The location is fantastic. Close to everything whether you are walking or taking public transportation.
My only complaint is that the apartment opens up on the first floor to a big and pretty loud courtyard and playground. It didn't bother us too much, but it's not the quietest spot if that is a consideration. If the windows are closed you don't really hear it and it rains a fair amount, so that keeps things quieter as well. Just thought it should be noted.