Staying in David's place was my first experience with AirBnB, and it was far beyond my expectations. In one word, it was PERFECT.
The location of the apartment is very convenient: very close to subway stations, in the lively neighborhood of Malasaña, but very quiet at night.
The apartment is bright, very clean and cozy. The room is good sized, and you have your own bathroom. The living room is perfect to hang out in.
But the best thing of the apartment is the host. David is very welcoming, and at the same time will respect your privacy and independence. He prepared me coffee in the morning and after siesta, took me to try the best croquetas I've ever had in my life and to drink delicious vermut: he's a real gentleman. It was exactly what I was hoping going to stay at a local's place.
If you are going to Madrid, you MUST stay at David's place.