A small, clean place in a very good spot to explore Madrid. No more than 15 mins walk from Atocha station, and about 20 from Puerta de Sol. Lavapies metro station is very close, which comes in handy for moving around.
Juan Carlos was very patient and responsive and his tips helped us organize our time and logistics.
P.S. The shower is quite small, so taller and more corpulent guests will have to get used to some acrobatics, but overall well worth the money and a great base of operations for solo travellers or couples. Warm recommendation!