We really enjoyed our stay at the apartment. Carlos and Orinda were very helpful and welcoming before we arrived and during our stay. We were sent lots of useful information about Valencia before hand too, which was helpful.
The apartment is spotlessly clean and it has everything you need.
The apartment is overlooking a busy street so it does get noisy at night. However, we stayed with our 2 children (aged 13 & 9) and it was never a problem for them or us. It is what you would expect in any city.
We also used their parking space to park our car. It's a few minutes walk from the apartment, but it's useful if you are coming by car. We did get a little lost finding the apartment by car as the roads have recently been pedestrianised and the sat nav we used hadn't been updated. Carlos kindly came and met us and came with us in the car to show us where the carparking space was, which was very kind.
Overall I would definitely recommend the apartment as a good base to explore Valencia