Great stay!
If you are planning in visiting Madrid try to stay here. Location is great, close to everything within walking (15min Plaza Mayor). The apartment is perfect, the living room make you feel at home and the view from the living room and terrace is amazing!
There is everything you may have at home, fully equipped kitchen if you want to prepare something quick, small desk, nice dinner table, and a comfortable living room.
The area is nice, safe and quiet. There are many groceries stores around if you need to buy something!
About Carlos, he was so helpful and always in available for any question that we had. Thanks Carlos!