I spent a nice night in Carmen's apartment. The room was not big but quite cheap and close to Madrid train station. Only 15 minutes by walk so it's good for tourist who have to take a train or airport bus while arriving or leaving Madrid. I didn't meet Carmen but her son was very nice to me. He got up at 5:00am to prepare my coffee because I have to go to the airport in the early morning. The budge room is suitable choice for a single traveler. I would like to recommend it! :)