We had a very nice time in the apartment! It is perfectly large enough for two persons, and it was very clean when we arrived. It has a nice kitchen and a few pans for cooking. Wifi works very well. The apartment has a central location, so all kinds of shops and supermarkets can be reached by foot.
The only "negative" aspect I can think of is that kitchen and bedroom are not separate by a door, so it is not optimal if one person e.g. wants to stay up late and the other wants to go to bed.
The apartment is in the seventh floor and there is an elevator you can use.
All in all we enjoyed the week at the apartment and we would recommend anyone going to Valencia to stay there!