Maria's apartment was in an excellent location. It's a great apartment for a night in Madrid, but it's not for you if you're interested in luxury accommodations. Check-in was a bit awkward, as the apartment was not ready at 3 and was still being cleaned. Additionally, the lack of wifi made it difficult to communicate with Maria throughout the stay. Although she assured me that there were places nearby with free hotspots, I did not find that to be the case.
There were several obvious places for improvement. The shower had no curtain, essentially making it useless as a shower. Additionally, the kitchen had a large drying rack taking up most of the floor place holding what looked to be a set of sheets - luckily we didn't plan to cook.
Overall it's a great place for a no-frills night or two in Madrid.