Carmen was a wonderful host. She was very attentive and always available for any concerns I had. For instance, one week I came down with a really bad cold and she really helped take care of me, giving me medicine and tea, like a mother away from home.
The room itself is as described, a bit tiny but comfortable. It is very hot during the summer months so I recommend getting a fan if you hope to sleep during the night. The apartment itself is in a great location, right next to Atocha and Retiro.
Would definitely recommend!