Apartment is absolutely excellent, hands down the best location ever, a beautiful turn-of-the-century building with an amazing view over the ever-busy Gran Vía. You can easily walk to Retiro Park or any of the major Museums from there, or to the bustling streets of the city centre.
The host is super welcoming and the rooms feel very private even for a shared apartment. Kitchen is superbly equipped and spacious, everything was really clean and we enjoyed our stay very much.
The ONLY drawback is that being the location that it is, it tends to be noisy at night, the windows are a bit old and don't offer much isolation from the sounds coming off the street. Other than that, perfect.