We only stayed one night, but the location seemed very central to a lot of attractions in Madrid. The room was in the basement and had beautiful coffered brick ceilings and we were told was part of an underground community. The bed was comfortable and the room was one of four downstairs. Because it was in the basement and we were there during a rainy week, it did smell a bit of damp and feel a bit damp. The bathroom(s) (one toilet room, one shower room, one sink room, and one complete bathroom) were shared and felt a bit like a hostel bathroom set up. The shared kitchen and living room upstairs were a nice place to spend some time.
Eduardo was super communicative and helped with all of our questions! He is a fantastic host!