My wife and I enjoyed our stay. Lisi was an attentive host who gave us all the information we needed for a great experience in our first trip to Madrid.
The apartment is comfortable and quiet, and just a 10-minute walk from the royal palace, the Cathedral de La Almudena and a few minutes more to other main attractions, like the Plaza Mayor and the Mercado de San Miguel. A neighborhood supermarket and bakery were right across the street, and several small restaurants--although, as customary in Madrid, most of them will open after 7 or 8pm. The La Latina subway station is nearby (another 10-minute walk), but I did not see elevators for people who need mobility assistance.
We had a great time in this apartment.