Luisa's place is so much better than we expected, it a very clean, big room, and it is almost as private as a separate flat. It has its own bathroom and a small corridor, not just a room. It is just 20 minutes away from the center, but the neighborhood is so authentic, calm, and non-touristic, full of small amazing bars and cafeterias with tapas, wine, cervezas and churros!
Very much recommended, we will stay with Luisa next time we are in Madrid for sure!