Very nice apartment in a very cool neighborood (tapas and bars and really close to the historic center). You feel at home (decoration, books, music, even oranges and cakes for the breakfast). Marcos and Joanna are kind and available (they live one floor under the apartment).
Just a little problem, the apartment is very cold in winter (13-14° when you wake up) and the radiators are not powerful enough to warm the place up. Too bad, otherwise it would be perfect. Despite of that, we enjoyed to stay here and we were out most of the time to discover the great city of Valencia.