I stayed at Carlos' place for a night while transiting through Madrid. The place is very close to the airport, and it's very worry free. There was a burger king and a Mcdonald's down the street, so it helped me have dinner for the night. Carlos is a very warm host. I was having a headache late at night, and he gave me paracetamol, which instantly made me feel better. Carlos also went to drop me to the airport in the morning, and I really appreciated that. All in all, there's nothing to worry about. Carlos will take really good care of you