We didn't meet Carmen, but a very pleasant young lady, Cristina was waiting at the flat when we arrived and she showed us around the flat and gave us information about the area. We didn't have any problem with anything so didn't need to contact our host during our 5 day stay.
Lovely flat, really lively and convenient area and we thoroughly enjoyed our stay. First trip to Madrid and thought it was a wonderful city and to be centrally located was great. We'd definitely like a return visit !