It's a great place to stay for one night when you arrive late in the evening or depart early in the morning. It's just about 15-20 minute walk away from the Madrid-Barajas airport (depending to/from which terminal). It's also in walking distance to the 'Barajas' metro station from which you can go to the city without the additional 3 euro airport fee.
Sergio is a very nice person and for aviation enthusiasts (like me) a great interlocutor.