Marta was so welcoming. I have food allergies and she even made homemade bread for me to eat. I am learning Spanish, and Marta is learning English, so we had quite an amusing time trying to communicate, often via Google Translate.
Their courtyard is like a little oasis in the hot city; trees and flowers shade and decorate the courtyard and house. It was lovely.
Note that guests do share the family bathroom (with a wonderful shower). Also be aware that they do not have air conditioning; few places in Madrid, even stores and restaurants, do. The daytimes are hot, but dry, and the nights cool off wonderfully, so one doesn't feel overwhelmed by the heat.