Great location, very communicative host, good hot water and shower pressure - though bathrooms and guestrooms are on different floors.
Eduardo was very sweet and was amenable to a late checkout... definitely something you should consider if going out in Madrid where the night first starts at 1 AM.
The guest rooms are downstairs on the basement level, so there are no windows/fresh ventilation which you should know if that's important to you. Super cute decor!