The ideal solution if you have to stop in Madrid for the night and you wished you had a friend who lived by the airport. Sergio is an excellent host and will make sure you have all the infos you might need.
Very well located and close to the line 8 Metro station, which will take you in 10 min to your terminal, or go to the city center for a visit. There's also a nice place to have breakfast nearby.
100% reccommended.