Hans place is remarkably located. Basically the heart of Old Madrid. Everything is walk-able: from the Palacio real to the Retiro park with its surrounding museums and the Atocha (train) station. Puerta del Sol and Plaza Mayor are a stone's throw away. First floor overlooking the Plaza Tirso de Moleno, right above a bakery and next to a supermarket - very convenient.
The apartment itself is exactly as described on Airbnb. Well equipped (great AC system if you are visiting in Summer), super clean, very well lighted and spacious.
Hans is very responsive and our local contact Lorenzo too.
5 stars all around