We stayed in Miguel's place for three nights in December.
Miguel is very responsive and easy to communicate with.
The apartment is as you see on the photos, it actually felt a bit bigger in person. You have all the amenities that you would need and the whole place is decently clean. When it got a bit chilly during the night/early morning, we either used the air conditioner or the electric radiator for a very short time and it was absolutely fine.
The location is good, most of the landmarks are within walking distance and the apartment is very easy to reach either from the airport or from the train station. There are some cafés and restaurants around and it was sometimes a bit loud around midnight due to the restaurant downstairs.
We definitely enjoyed our stay and would recommend Miguel's apartment to anyone looking for a q/p stay in Valencia!