First, I must say, the apartment itself was fantastic. It had everything we wanted and more. Rafa is an excellent host, and really helped us to settle in.
The problem is the location of the apartment is underwhelming. Nothing noticeable was close by and the street the apartment is on is very old, and unappealing. There is one close by bar, that is close enough to be loud, but it did shut down around midnight. For first time Valencia visitors we needed somewhere closer to a busier place, making it easier for us to explore the city.
We ended up leaving, but it is mostly due to our personal preference of the area rather than the apartment itself. You may like the area and be satisfied for staying there for your trip.
P.S.: The wifi was very poor but Rafa tried to fix the issue. We left before the issue was resolved.