I can say this place is one of my best AirBnB stay.
Irina and her husband met me in person and explained every detail of the apartment. Since I visited during Christmas, they searched a lot of restaurants which could be open, and it was helpful. In addition, they gave me useful information of Madrid. Location is good too, and metro stations are walking distance. From airport, it takes around 40 minutes. And major sightseeing spots are easy to access by metro.
The building is more than 100 years old, but Interior is excellent and I want to live in such a nice place. Neighborhood is quiet and you can sleep well. There is no elevator, so if you carry big suitcase you may have difficulty.