This flat is lovely and stylishly homey! It is right in the centre of Madrid, close to Opera metro station, an easy walk to Puerto del Sol, Plaza Mayor, Mercado San Miguel, and Calle Arenal. In other words, a fabulous location. It is located on the 5th floor, but there is an elevator. It was quite noisy on the weekend nights, but that was because it was in such a central area.
Oscar responded very promptly to all our questions before arrival, and kept in touch during our stay also.
I would highly recommend this place.