Las Letras had the most unusual effect upon us, and we agreed in retrospect - the way it is designed and managed results in minimal interaction with staff. Everything gets done, everything is offered and in place, and they are available at any time - but they are not constantly hovering at your back like, for example, staying in Tokyo. It was far more sophisticated than than. We really enjoyed the place.
Poor wireless Internet but bring your own cable, or ask for one, and you can run on a wired connection (far superior in all instances than wireless ever is). Wireless is weak in every room I tried including actual room, bar or restaurant. But is it there and free so I am not complaining.
Large room, effective climate control, decent bathroom, very clean and very quiet.
Great location for exploring Madrid. You are easy walking distance to the Prado, several major squares, the palace and numerous pedestrian-only shopping areas.
Highly recommended, modern and upscale. Great bar, great buffet breakfast. Extremely helpful front desk staff.
Calle Gran Vía, 11