We stayed at Eva's sister-in-law's apartment for 1 month and really enjoyed it. The apartment is large, well equipped and comfortable, and is located on the corner of the beautiful and hip neighbourhood of Russafa. The kitchen has ample cookware and there is a separate wash/dry room for clothes. The beds are really comfortable and the main bedroom and living room have air-conditioning. It can be noisy when the balcony doors are open, with the sound from nearby building works, cars and dogs, but you can easily shut this out by closing them.
There is a decent supermarket and a local green grocers for fresh fruit and vegetables 30 seconds from the apartment, with a vast range of alternatives in Russafa if required. The walk in to the main centre takes around 20-30 minutes, but there's lots to see and do on the way. We were easily able to rent bikes and cycle to the beach which took us no more than 40 minutes on the safe, cycle paths.
Eva was an outstanding host before and during our stay, always responding quickly and going out of her way to help us with anything we asked. It's worth noting that the apartment is actually owned/managed by Inma, Eva's sister-in-law, which we found out when we asked if it was alright for my parents/brother to stay one weekend. The issue was mutually resolved but it's also worth noting that extra guests will cost more.
Valencia is a beautiful, diverse city and this apartment was the perfect base for our stay.