The place is a cute small apartment in the city center of Madrid. It is very well communicated, with the Sol station about 5-10m away walking. It is right by the Plaza Mayor and the Mercado de San Miguel, and although the area is very noisy, the house is very well isolated and you can’t hear anything. There is no elevator access (during the renovations they seem to have condemned the door, and extended the apartment over the old hallway, but it is still there, which is not bothersome but a bit quirky) so be careful if you haul a lot of baggage.
It has TV and Netflix, very good AC and a big bathroom. The kitchen is in the hallway and has a washing machine.
In summary, it is a very small, functional, clean and cute place in the middle of the major touristic areas of Madrid, and I recommend it