I highly recommend Manuel's apartment. My sister and I stayed there over a long weekend and we absolutely enjoyed our stay. Manuel was a great host and was always quick to respond in case we needed anything.
What I probably liked most, was the spacious terrace, which offers a stunning view over Valencia. The apartment itself is modern and very well equipped.
Due to the apartment's excellent location right in the centre of Valencia (literally next to the City Hall), it is suited perfectly for those wishing to explore the city. The metro station is just a few mins walk away and there are several bus lines stopping basically around the corner from the apartment (eg buses going to Valencia beach). Also, just a suggest for those arriving with an early flight or having a couple of hours left after check-out respectively: You can leave your luggage for just a couple of euros at the Estació del Nord Train Station (approx. 5 mins walk from the apartment).