This was my first staying through airbnb,com. and, I had a great experience.
Margarita is warm and friendly host. and, My room is not only clean & comportable, but is in good location.
The only disadvantage is she doesn't speak English, but It's not a big problem for me. (Her daughter, Maria can speak English.)
If I visit to Madrid again, I'm willing to stay Marga's home.