Marta's apartment is pretty much exactly as how it is on the pictures. The atmosphere and the design are very inspirational and set the tone for a nice stay. The location could not be any better. It is right in the center of the center, but at the same time, it is in a quite small street without any major bars. So, you get the best out of everything.
If I had to mention one downside of the apartment, than it is the location of the toilet, which can only be reached via the bedroom, thus in case more than two people are staying, this may cause some inconveniences. However, apart from this, the apartment is really a fantastic place, and I can happily recommend it to everyone, who wants to explore Madrid from a prime location, and want to have a safe and warm haven to return to every night.