This was my first experience at Airbnb and I really enjoy it! The apartment was very cool, clean, with a good heating (it was winter so extra points!!!) and very close to metro station. For me was very easy to get to any part of Madrid...
Maria has a host was super. Very nice person, pragmatic and with a strong willing to make you feel you're home. With my awful spanish and with her good english there was no communication problems.
It was for sure a great choice for rookies like me :D