This place is awesome, and I can't imagine a better host than Elvira! You absolutely can't beat the location, walkable to the the train station, as well as tons of points of interest around the city. The building/apartment/room are very clean, modern, and comfortable. Elvira will tell you all about the city and give you great suggestions, is happy to chat at any time, but at the same time is also great about giving you your space.
Sin duda tendréis una visita perfecta en Madrid si elijas este lugar!