I booked Constantine's apartment for my parents and brother when they came to visit for three days. It was our first AirBnB experience and certainly a most pleasant one. Constantine made sure that everything went smoothly—from arrival to departure—and was very helpful with everything we enquired. My family felt very comfortable in the apartment and was very content with its amenities, location, cleanliness and decoration. I would definitely recommend Constantine's flat to anyone who would like to discover Madrid and stay in a central, convenient and safe location.