I stayed at Gisselle's for one week. The flat is clean and quiet and it's located right in the city centre, in a pedestrian area close to shops and within walking distance from the main tourist amenities. Gisselle made me feel very welcome and she was also flexible with both my booking in and booking out hours. I enjoyed my stay and I would recomend Gisselle as a host and the flat for both its location and general feel. I'd definitely go back if I'm in Madrid again!