Super well located, in a quiet street but near everything. Stores and restaurants are close enough, city center is just a few minutes walk so you're kind of in the heart of the city but still out of the super touristic route, which is perfect.
It is a mix of hostel and apartment where you have your own private room but share bathroom and kitchen (really well equipped) with the other guests.
Dani is really responsive and will give you good tips about the area. Would definitely stay again if I return to Valencia.