Maria Jose and her sister Soraya were great hosts, very friendly, helpful and extremely easy to communicate with. The apartment is beautiful and very well-equipped, you really won't miss anything for shorter or longer stays — we stayed one month and felt at home! The street is not very noisy but keep in mind that garbage collectors can make a bit of noise in the morning.
The location is great though, safe yet really close to everything and just behind the amazing Turia park. You can walk anywhere in town from there and there are a bus and a metro station very close. It's more expensive than some other places but that's the place to stay at in Valencia if you're not on a budget!