Miriam and Aarons place was perfect! Great walking location to all the major sites. I stayed at their place for 1 night as a "long layover" in Madrid, and I was able to see everything on my list and more due to how conveniently located their place is. Although you're renting just a room, it feels like the whole place is yours. Also, some of the proceeds that they make from their Airbnb rentals get donated to a great cause. Definitely going to stay there again next time I visit.