My best stay yet using Airbnb. I was there just 1 night because I was doing a quick trip from Dallas to Madrid to earn double miles on my airline, but I will remember this trip fondly. Charo and Conrad are excellent hosts - Charo generously shared her knowledge of Madrid and introduced me to "porras" with cafe con leche at breakfast - she even got up early on Sunday to get them. It's like being part of a family in Spain.
The location is excellent, a little north of Puerta del Sol. I hope to get a chance to return soon!