I had a very nice stay at Stella's apartment. The location of the flat is superb right next to Rusafa Market. The room is very nice and even brighter and with more daylight than it appears in the pictures.
In January the flat was very cold during the day as whenever the heating was off, the flat cooled down immediately so that I needed to wear a jacket. As far as I'm informed the bad insulation is a problem with Valencia houses in general. Just something to keep in mind if you visit during the winter months.
The walls of the flat are very thin and sometimes at night I could hear Stella's daughter crying. But she made up for it during the day by always greeting me and being super lovely in general :-)