We stayed two nights in Fernando's studio with our 7 year old daughter. The location is splendid. Five minutes walk to the beach and the neighbourhood El Cabanyal is wonderful. There are no stunning sights, but you can pass hours wandering the streets enjoying the traditional tiled houses and modern graffiti. Despite the great location, the area is not so touristy, and there are plenty of authentic bars and restaurants. We particularly enjoyed a trendy pizza place nearby called Festinar, where you order little pizzas for €2.50 and the toppings are a surprise. Our daughter particularly enjoyed doing an improvised 'treasure hunt' finding tile features and graffiti around the neighbourhood.
The flat itself is functional and good for a short stay - as the description says. The orange juicer is a nice bonus that we made use of a lot - Valencia is all about the oranges!
It's also really great that Fernando offers bicycles. Valencia is a great city for cycling, and you can ride almost all the way to the centre on separated safe bike lanes.
Fernando himself was really helpful and friendly.