Ricardo's appartment is located in a very nice neighborhood, Ruzafa, which is full of bars and life. It's also very close to the city center and the old town, as well as the City of Arts and Science.
It is a beautiful appartment, fully equipped. The only disavdantages are the lack of a door at the bathroom (it is connected with stairs with the bedroom/living room) and the fact that there is no soundproofing (so you can easily hear the neighbors' conversations, or at least their possible noise).
Nevertheless, I think it is a very good choice to stay when you visit Valencia, even for more than a week.