This is a good apartment, we really liked it. The location is good, with the beach and the City of Arts and Sciences both close by, as well as being really close to the metro stop. Maarten was great, proactively sending us information, but there were some minor issues.
Firstly, the hobs don't really work. They don't stay warm at all so it's impossible to cook with them. Secondly, the boiler doesn't hold a lot of hot water, probably only enough for 15 minutes of showering at once. This is fine if you know in advance, but it did mean I got a cold shower after my wife used all the hot water! Finally, the bed wasn't the comfiest, but again, for a short stay this is fine.
Lovely to have a balcony, but unfortunately didn't really get to use it given the time of year. The air con also blows warm air, which is really good after some of the chillier evenings.
Overall, it's a good apartment and it was very reasonably priced. A couple of minor things, but nothing that will really affect your holiday. Gracies!