The apartment is nice and in a fantastic location. You can walk to all interesting spots and if you don't want to, you can take the metro or the bus, that is only a few min away.
Advise: if you are planning to use the sleeping couch in the apartment, make sure to tell it beforehand so that bedclothes are available. We had a little misunderstanding there - but that one was solved very easily.
All in all, we enjoyed our stay in Valencia very much!! :)