Juan's apartment was really lovely once you have climbed the stairway to heaven, for us it added to the adventure but not recommended for super heavy luggage or small children.
The balcony is extremely slanted and I didn't really want to be walking around out there especially after a couple of beverages.
The upstairs bedroom was very comfortable and I slept really well.
All in all a great place to stay and very centrally located.
One thing to note is that in Valencia you need to take the trash out and dump it in city provided receptacles, ask where they are as they are easy to find once you know.