We really enjoyed our stay at Liliana's loft in La Latina. I used to live in Madrid and love this neighbourhood; it is full of great bars and is very close to a couple of metro stations. The view of the cathedral was awesome and it was incredibly quiet at night. Liliana was very responsive to all of my questions and accommodated our early arrival which I really appreciated. My only note would be that although it says 'sofabed' in the description, it is really only appropriate for use as a couch.
Finally, in response to past airbnb'ers comments, the mattress on the bed was recently replaced and we had a comfortable sleep there.