I stayed at Hevert's place for 5 days and I'm very happy with my choice!
The position is just perfect, very central and close to the Gran Via, also at walking distance from the metro entrance. during my stay, I took the metro just once. The room is small and essential, but very clean.
Hevert was very nice as a host. He took his time to explain the basics of the room and house when I arrived, and then he was always available when I had questions or doubts.
I would definitely recommend to stay at Hevert's place to anyone who wants to visit Madrid and doesn't mind an essential room.