I was staying with Martha and Francisco for 10 days and I can recommend this AirBnB 100%. The rooms were clean, the bed was very comfortable and they were both super nice! I am learning Spanish at the moment and they did not hesitate to practice with me :) The house is in the north of Valencia and you have approx. the same distance to the beach and to the city center.
A really, really nice experience in general and when I come back to Valencia, it is very possible that I will go there again!