I had a great stay at Violeta and Diego's place. The room/bathroom were spotless. The room is also very private as it is upstairs on the side. Violeta and Diego were great hosts. They even invited me to join them and their friends on an outing which was lots of fun. I got a nice tour of the neighborhood with them and they know the area very well. They were easy to communicate with, available and fun!
I will definitely stay there when back to Madrid. Highly recommended place.