Our stay in Alvaros flat was really good. It has a lot of space, a nice kitchen and very nice details. The region is very awesome itself (a lot of cool streetart and alternative places) as well as to get to know Valencia and be at the beach very quick. The communication was very easy and the hosts were very flexible regarding Check-in and Check-out time, we appreciated it!
I think because we stayed off season, there were a few things not as perfect as the other guests have written. The flat was not very clean and there were a few things missing, that were indicated to be there in the description (e.g. soap and included breakfast). But as it seems it was just the case for our stay. Still, I recommend Alvaro's flat.