We stayed one night in the apartment in transit to Barajas airport. We appreciated the location close to Chamartín train station, because we wanted to the take the tren de cercanías (commuter train) to the airport the next morning. Also, many cafés and restaurants as well as a Mercadona market close by, and some pleasant streets for strolling. The location felt very safe as well. Carlos communicated with us constantly and was very prompt about answering our questions. He sends you very complete information on the apartment--do make sure to watch the video he sends on how to open the balcony door--it's very clear and easy after watching it. Being noise-sensitive, we really appreciated the silence of the apartment. The windows are good quality and you are on the last floor of the building. Wifi worked perfectly for a work Zoom meeting. Great option for those who want easy walking access to the Chamartín train station.