To be honest, I am very sad I can only give it 5 stars. Rossana and her property really deserve 10 stars. This is a place that not only is extremely well located, it is cozy, well lit, basically new, very clean and well kept, with a comfortable bed, half tinted windows (for privacy), and the owners are very responsive if you have any questions.
I mean, to be in a place that has the Opera Theater, the Royal Palace, Plaza Mayor, Puerta del Sol, the Gran Vía, the Mercado San Miguel, and so many options to eat, drink and have a great time, all at less than 5 or 10 minutes walking, was really awesome. My wife and I walked so much, not because metro stations or bus stations we far, on the contrary, but because we felt confident that most of the places we wanted to explore we nearby or we could go walking and come back using the Metro or a bus, if we needed to.
Seriously, if you go to Madrid, this is the kind of place you want to stay in.