I highly recommend this appartment because of its comfort, cleaness and location. It is perfectly suitable for a friend or family trip. While being in a very quite area (no noise at all), it's very close to a main street with many bars and restaurants (5 min walk) as well as to Puerta del sol (15-20min walk).
I was there with my parents and my two brothers who shared the two bedrooms. As the fifth person, I slept on the couch in the living room which was very comfortable. Since you can close the door, the living room could also work as a separate bedroom.
In addition, the communication and the service were great. Ernesto got in touch with me after I left to inform me that i forgot an item in the house. He was very kind in sending it to me by mail to switzerland that same day.
Ernesto and his brother have been 5 stars hosts! Thanks again!