Let me start by saying that Rafa is one of the best hosts I've ever encountered on this platform. He was very helpful with check-in and recommending activities around Madrid.
The duplex apartment has a great location. It is a 5min walk to the main train station in Madrid and also to a great number of beautiful neighborhoods in the center of Madrid that offer great food and nightlife.
The apartment has two small bedrooms each with its own bathroom. The kitchen and living room area is also a bit small but if you are in Madrid for tourism you better not stay inside.
Overall it is a great location if you plan to walk everywhere.
If you have a rental car there are plenty of parking options.
Thanks!