Sergio is a very kind and gentle host. The place is near a beautiful park along the little canal and walkable to the city centre (around 25-35 minutes) with a unique interior, handmade wooden kitchen and furniture. The only problem I had is the place has no window and no ventilation so it was a bit hot during the summer (I stayed there in mid July) but there was a portable fan in our bedroom which is quite helpful. If you want to have a unique and peaceful stay in Madrid this place is highly recommended!