From the apartment itself, to the excellent communication during the booking and arrival process, we highly recommend staying at Carlos and Nerea's apartment.
The area is very residential, but is perfectly located in order to offer convenience both for the City of Arts and Sciences, and the metro. Both are within around 10 minutes walk. There's also plenty of options within 5 minutes walk for buying food (supermarkets, fruit/veg, patisserie).
The apartment is lovely and has everything we could possibly have needed for our stay.
We were greeted immediately on arrival and given some local tips on places to visit and restaurants, and would be more than happy to return again in the future.