We stayed for a week. The location is great - 10-20 mins walking to everything and many great restaurants less than 5 mins away. Marta was quick to respond and sent great recommendations for places to eat, museums, and even flamenco!
The place was a good size - the bathroom a little small but manageable! The beds were soft and the heat worked well. We had to buy toilet paper, paper towels, and coffee pods since they didn’t supply enough (2 pods and 2 rolls of tp). I’d say this is a good place for a few nights.
If we come back to Madrid I’ll definately look at the other places Marta has!