My wife and I stayed in this AirBnB, and it was absolutely perfect for our week-long visit to Madrid. You can't ask for a better location -- extremely close to Plaza Mayor and all other major sites in Madrid, very near to an incredible tapas street of Cava Baja, as well as just around the corner from a supermarket and metro stop (La Latina on line 5). Iñigo is also an incredible communicator (both in Spanish and in English), and he went above and beyond to ensure we had a smooth check-in despite some delays on our end.
The apartment is small, but it has everything you need. We enjoyed our stay immensely and hope to come back again soon!