We had a great time in Valencia.
Our stay was mainly driven by my 5 years old son and we have spent two full days in Valencia Bioparc and L'Oceanogràfic. The apartment is walk way to Bioparc and half an hour by ETM buss 95 to L'Oceanogràfic which was really convenient. Additionally, it is relatively close to the airport (17 min by subway), so if your flight back is early in the morning like in our case it saves you a lot of time. Same is valid if you would like to go to city center.
The apartment itself is nice. It has new kitchen and overall is in very good condition. I would say really cosу for people with children and not only. The only minor downfall is noise isolation. It is typical for Spain (I have been in many diff. places), so to me it is not a problem at all. However, some might be bothered. Other might not like the neighbourhood as well, but I would say that is far better than city center area.
Our host was great as well, check in, check out, recomended places, really all good.
Thanks for the great stay Lionela!