I stayed 3 weeks in Ruben’s apartment. Ruben is a nice host, who really cares for his guests. The apartment is good for a (longer) stay in Valencia. The apartment is, depending on the definition of city center, 20 minutes from the city center by foot (Plaza Espana). And it is just a 2-3 min walk to the metro station Patraix . With line 1,2 or 7 you are in 10 min in the city center and in 30 min (line 7) at the beach. Besides, a taxi is never far away in Valencia!
I agree with the other reviews that the kitchen could use some more tools, like a water cooker and wine glasses. But it was sufficient for 1 person.
+ Very good wifi and clean.
- third floor, no elevator (but Ruben will take your 20 kg suitcase up the stairs, thanks!), minimalistic household equipment.