I've stayed in many AirBnb's in Madrid and this by far was one of the best. The location is great as stated by many others, right by all the major museums and within walking distance of great neighborhoods like Lavapies, La Latina, Santa Ana, Letras, Madrid Rio, Retiro, Sol and the Plaza Mayor, or easily accessed by the Metro.
I stayed for a month and the apartment has everything you need for a short or long stay, we felt at home in the apartment. The apartment is on the top floor with elevator access in a secured building where we felt extremely safe. Although the apartment has an interior feel, is bright and cheery with 360 degree window exposure. There is air conditioning in both the living room and bedroom providing much needed relief from those hot summer days in Madrid. The bedroom was quite large with plenty of closet space, a nice desk and sitting area.
The best part about the apartment in my opinion is that it is quiet, especially for sleeping at night. I've stayed in many apartments in Madrid with paper thin walls and noisy neighbors but Miguel's apartment was the quietest place I've ever stayed in.
Communication was responsive, Miguel was generous with allowing my to check in early due to any early flight and promptly handled any issue that arose. Recommend Miguel's apartment without hesitation!