I stayed only one night at Norma's house, since I was traveling ahead the next day. Norma is very welcoming and a nice person to talk with. She showed me around her neighbourhood and helped me out with the metro.
Norma's house is cosy and very clean, and provided with all I needed for the night I stayed. The house is well located, in a good neighbourhood. Like others already said, the accommodation is close to a metro station with a direct connection to the city center (metrostation Vodafone Sol). Also, the airport is just 10 away by taxi.
Norma did explain me how to get to her house by bus, but due to my own fault I had to take the taxi.
I would strongly recommend a stay here. When I would be in Madrid another time, I'd be sure to consider the hospitality of Norma!