Maria and Carlos’s place is great. The location is fantastic, close to many eateries and bars, but also to the major sites. Depending on your pace, it could be no more than 20 minutes to the Palace/cathedral/museums. The nearest Metro stop is a 5 minutes walk from the apartment. So it is easy to access by public transportation.
The apartment itself is cute and nicely arranged. It is a little smaller than it appears in the pictures, but it is fine for two people. The only word of warning is that the stairs to the loft are quite steep.
The bathroom and facilities overall are great. The kitchen is equipped for some basic cooking. I was very satisfied with the apartment and Maria and Carlos are fantastic hosts: responsive and full of helpful tips. I highly recommend.