Me and other 3 friends were in Valencia for a conference and we found the apartment of Carlos and Maria quite perfect. It's really near the City of Art and Science, it takes only 5 minutes by foot. The zone is silent and it is a pedestrian zone, 10 minutes far (by foot) you'll find a Mercadona (the supermarket, really convenient) and there's also a nice Bar to have breakfast just in front of the main door. The apartment was really good and clean, kitchen fully equipped, only few problems with hot water but Maria promply helped us so it was really not a big deal. Nice kitchen, and there's also a small and nice balcony to have dinner (max 3 persons). Really a nice stay :)