I stayed at Gemma and Angels apartment for a month and I must say they, as hosts, they were amazing. They made me feel very welcome and nothing was too much trouble. They offered an airport pickup service which was fantastic for me as I did not know the city very well and of course I dont speak spanish, just a few words to get by. Well worth it.
The apartment is in a great locaton in the Ciutat Vella which is a beautiful part of Valencia and full of charachter. The little street the apartment is on is very quiet at night as it is a cul del sac but at the same time very close to everything, shops restaurants, coffee in the morning. I walked everywhere from the apartment though it is close to all the mayor bus routes and the metro.
The apartment itself is well equiped and comfortable and has everything you would need for a stay in Valencia.
I highly recommend it.