The apartment location is good, though expect to hear the church bells on the hour every hour from 8am (so if you're a light sleeper this might not be for you). There's also a very popular local restaurant directly underneath the apartment so it's definitely a lively area to stay!
Some nice aspects of the apartment but it was strange and uncomfortable to have 2 mattresses on top of each other for the bed. For us this could be improved, along with some fitted sheets.
Recommendations for Valencia restaurants: Pulpo & Jamón Jamón