We were only in Madrid for one night and Sergio's place was exactly what we needed. Sergio was a great host, very attentive person that make easy our check in.
This is a clean and comfortable space for 4 people that has everything you need. Very well located. Anton Martin metro station in the same sidewalk or 15min within walking distance to Atocha station and most tourist attractions. This is a first floor apartment with comfortable bed, but not AC. We had to open the bedroom window to ventilate the room. So, you may hear noise from the neighboring apartment. Medium-sized wall does not isolate anything. However, it's a good value for the money!. I definitely recommend it