Joaquín is a great host. I don't think I ever waited for more than 5 minutes to get an answer to my emails. The apartment is a rare example of a truthful representation of what the actual place is supposed to be and look like. Trust the pictures and the description (with the only exception that the parking isn't private, but on-street). An extremely cosy apartment very close to the underground station. A 15 to 20 min drive away from anywhere you might want to be in Madrid. A fairly big supermarket about 3 min walk away. Will definitely try to stay there again next time I am in Madrid.
Gracias Joaquín!