The apartment is in a great location in the center of Madrid, on a busy shopping street. Any major attraction and a lot of restaurants and bars are in very close walking distance. We happened to be there on New Years Eve and watched the crowds and fireworks from the balcony. That was amazing!
The downside of this location is that it is very noisy from the street. it's quite after midnight but never really quiet.
The apartment is mostly as described, very modern, clean and spacious. The street facing bedroom might be too noisy for light sleepers, but the rear bedroom is very quiet and has its own spacious bathroom.
Unfortunately the third bedroom is nothing more than a closet off the kitchen, with a small bed, no windows and a washing machine in there, too. That was a bit of a letdown and a bad experience for our daughter who was unfortunate enough to have to sleep in that room.