Rosaria's place is located really well for all the main Madrid sights, museums and parks. I spent two days there and saw most of the main landmarks getting around on my foot.
The place itself is clean an tidy and filled with her own artwork and it has a spacious balcony for relaxing and enjoying sunsets over Madrid.
Rosaria is very hospitable, gives good local tips about restaurants, landmarks, museums or anything else you are interested in. Highly recommended for people doing sightseeing in Madrid, couples and people traveling for work.