Isabel and her husband are very warm hearted hosts. It is easy to hang with them in the apartment, at the same time you are very free to keep your privacy or a quiet time by yourself. As a local people, they have very good specific suggestions for me to go around Madrid city.
The apartment is super clean and cozy. I stayed by myself but for two will be totally enough. Very sophisticated but not too much decorations. The kitchen really makes you feel like home.

Location wise is fantastic. Literally everything is in a walkable distance but avoided the hectic shopping streets. Quiet in the evening and a lot of food market, cafe, restaurant, bar and park around.
If I am coming back to visit, definitely will come back to Isabel's.