Rosa is an artist and her house is a quite and positive place to stay in central Madrid.
She is very friendly and independent and will give you the tips for a authentic Madrid experience.
There is a private room and a private bathroom next to the entrance of the house, so it is easy to go in and out with out disturbing each other.
Close to the house there is Anton Martin metro station, the food and vegetables Market and the most famous Flamenco School in town. Enjoy!