Carlos is a great host. He went up and above to provide us with everything necessary and made sure we were happy with our stay. We arrived late at night but he still welcomed us personally and provided a full mini fridge of food for us. The place is quite small but is very comfortable and equipped with everything one might need. It's located right in the center of Madrid, close to the old town and the Sol square. It's right on the metro. We would definitely stay in Carlos's place again.