This apartment is the place to be in Madrid. You cannot be more central. Everything is just a walking distance away. All the touristic places and many restaurants and bars. If you want to get around Madrid, the Metro station is 3 minutes to walk or you can walk 8 minutes to a train station (Sol) to go to really cute and nice places outside of Madrid city center.
The apartment is clean, sunny and well equipped. I could also recommend it for a long-term stay (I indeed stayed 3 months). The communication with the host was really great and fast and they are happy to help or give recommendations,... whatever you need (:
I enjoyed staying there!