Nice little apartment right in the heart if Madrid. Most sights are walking distance. Located in a very lifely side road of Plaza del Sol.
The apartment has everything one needs, even for longer stays. Suits good for two person. Only downside: it's a combined living/sleep room, so you might not want to invite someone over.
There are several bars and restaurants in the street. This is good if you want the enjoy the vivid nightlife of Madrid. But don't plan to go to bed before 2AM.