We stayed in Luis' apartment for 5 nights and it was one of the best AirBnB apartments we've stayed in. It's just as beautiful as it is in the photos and has all the basic amenities that you would need. Just a bit of warning for tall people: the bathroom is quite small. My husband and I are quite short and thin, so the small bathroom wasn't a problem.
Location was great -- walking distance to most of the sights and just a few steps away from the Grav Via metro station.
Luis was very helpful and great at communication. Upon our arrival, he gave us a map and showed us where all the best restaurants, party places, and sights were. He even had a bottle of wine prepared for us. Thank you Luis for hosting us! :)
Highly recommended AirBnB!