Luz's apartment is a wonderful base to use when visiting Madrid. Her apartment is a 30 second walk from Plaza Mayor and the San Miguel market, 5 minutes from Puerta del Sol, and less than 10 from the palace and the Gran Via.
The apartment is immaculate and has a lot of really nice touches (lots of complimentary food/snacks, toiletries, tourist guides, etc). It's got a trendy style and is city living at its best.
Luz is incredibly nice and helpful, she really takes pride in her place and it shows!