This was a great flat to explore the city of Madrid from. It is just round the corner from the Atocha train station, the Reina Sofia, Prado and Thyssen museums.
Mercedes and Enrique have provided a well kept and clean flat, with all you would need for your stay. The flat is on the forth floor with no lift, so you get plenty of exercise especially if you have heavy suitcases.
The only issue we had was with the hot water, which ran out quite quickly in the shower, however we managed ok.
So if you are ok with walking up four floors each day, are good at having a quick shower I would definitely recommend this flat.