Luis's listing was the first stop in our 11-day road trip across Spain and Portugal so it was important to have a good start. And by all means they delivered it pretty well.
Luis was working the night shift during our two nights stay so it was unfortunate that we could not meet him in person. We arrived quite late in the evening due to a flight delay but Luis's wife Belén was there to greet us. She speaks very little English but that turned out to be a big grace as she became our very patient basic Spanish teacher.
The room, shower, and the house in general were tidy and very comfortable. The unit is only a few minutes away from the metro station which happens to be on the same line to Plaza de Sol, Santiago Bernabeu, and other central Madrid attractions. Convenience definitely came as an added advantage.
Belén took a very good care of the unit and she was there at all time to cater to your needs. She even tried to help book Alhambra tickets for us before we left for Granada but they were all sold out (we managed to get them the following day but that required us to queue up for a couple of hours early in the morning though it was all worth it!)
Overall, if you happen to come to Madrid through the airport and look for a nice sleep and easy commute to the center, look no further. Plus you get to stay with nice folks.