Carlos' apartment was the perfect place to stay for our 36 hour visit to Madrid! The apartment is well located: we were able to ride the train from the airport and walk just 15 minutes to get there, and for those that like to walk, you can get to many of Madrid's main sites on foot easily. The apartment was filled with thoughtful touches like biscuits to have with coffee and individually packaged toothbrushes in case we had forgotten ours. We were just two people in the apartment - the space could definitely accommodate another couple on the convertible couch (as shown in the photos) though you would have to be ok keeping luggage in the living rooms as bedroom spaces are small.