The apartment is really nice. It's spacious, there's airconditioning (!), it's clean and well prepared. It's located well, and though I've read some comments where they complain about the street noises - we weren't really bothered by them.
Nacho and Jacobo were very flexible and helpful with check-in an check-out, which was nice because our flight arrived early in the morning and left later in the evening. They welcomed us and showed us a bit around on the map.
If there's something to note, it's that we found a few cockroaches - but it wasn't too bad and they were only the small kind. I guess it's hard to get rid of them in this climate and environment.
All in all, we were happy with our stay here. Definitively would recommend to hire a bike to go around in the city and explore the different neighborhoods.