If you want to enjoy all that Valencia has to offer, Maria's place is the best option. It's close to the beach (10-15 min. walk), the hosts offer great recommendations for shops and restaurants in the area, you can easily reach the center of the city (either walking or metro) and the apartment is simply beautiful. The only thing you need to be prepared for is sleeping in the smaller room (with the single beds) as it has no air conditioning and if you are not used to the heat, it can be quite difficult to get a good rest. All in all, definitely recommend!