This is a cozy, beautiful apartment right in front of the Puerta de Atocha train station, in a very centric area in Madrid, surrounded by bars, restaurants and many local businesses. Everything was clean and organized, and exactly as described. Communication with Arnaldo was prompt, friendly, and he kept us well informed of the rules as well as the check-in and check-out instructions. Please make sure to follow each step of these instructions closely and you'll be successful with checkin into the apartment with no trouble.
We'd certainly consider staying here again for our next trip to Madrid in the future.