Excellent stay at Maria's apartment. We stayed for two nights and Maria provided us with lots of travel information and local places to visit. She stayed in communication with us all the way through and responded very quickly with any questions we had.
The apartment was very stylish and clean, it was in a residential type area just outside the busy centre and only 5 minute walk to the nearest Metro/Underground, so getting in and out of the centre was easy.
We would definitely stay here again on a return visit to Madrid.