The apartment was wonderful. It was a nice size for a one bedroom, and was very well appointed: modern and stylish.
Also, it was absolutely spotless.
The location is incredible. About a 5 min walk to Plaza Mayor, a 6-7 minute walk to the Royal Palace, and although a bit farther, very walkable to the Prado. I didn’t use the metro at all. Also, lots of restaurants and markets around.
Highly recommended.