I would definitely NOT go back.
The good: the location is perfect, especially if you want to go to the City of Arts and Science. It's an easy walk there and it's also well-connected. You can take a bus to the train station and to the beach. The room is spacious and clean.
The bad: this is not really what Airbnb is supposed to be all about. This seems more like a company that bought either the whole building or a good part of it. The floor we were staying on had 5 rooms, so you might be sharing with 10/15 people (who knows) at a time. There are two shared bathrooms and a shared kitchen. This would not be a problem if there were actually someone there most of the time, but we stayed there for two days and we only ever saw one cleaning lady and no receptionist, guard, manager or anyone in charge for that matter. The place was only clean for a couple of hours, but with so many people and no one there to check on them, the bathrooms got disgusting in no time. One of the sinks went from slightly clogged to completely clogged in one day. The kitchen is a mess. You're supposed to be able to use the fridge, but since there is no control over who comes and where they put their things, it was impossible to use it. We only had some fruit we wanted to store, but it wasn't an option. There were dirty dishes in the sink the whole time. Same thing with the noise. You're not supposed to make noise after 23:00, but since there is no one there, we just had people coming into the shared living room at 3 am and making noise without a care in the world.