First of all, the breakfast served with the morning sunlight streaming in was absolutely delicious!
Also, when we mentioned that we were checking out early in the morning and couldn't have breakfast, they made us a picnic bag.
The hotel is very close to Atocha Station, almost next to the Reina Sofia Art Center, and extremely close to the Prado Museum and the Thyssen-Bornemisza Museum, and is conveniently located within walking distance of various restaurants.