I had a great time staying at Beatriz's place - the place was warm, cozy, clean and spacious, enough that it could probably accomodate a double bed even though it has just a single one. I was pleased to find a clothes cabinet, fast wifi and an appropriate working table in my room, also blinds for privacy. It was easy to find shops and the metro station (with easy connections to the airport) and Beatriz was easy to comunicate with at all times.
The only two caveats I would find are the pretty late check in time (which wasn't an issue for me and 3ss was clearly communicated in the listing) and the fapt that the room itself doesn't have a key lock or a deadbolt - so you cannot lock your room when you're inside or outside, only the apartment door itself and the doenstairs entrance have a lock - it wasn't an issue for me as it is a private place but other people may feel otherwise.