I stayed at Charlie and Edu's for three nights with my cousin and absolutely loved it! We received a very friendly welcome and we're shown around the house. Our room was clean and well appointed with a really comfy bed! There was a kitchen for guest use as well as a fridge freezer stocked with butter, mayo etc for guests to use. They also had a "take and share" table for guests to enjoy communal things like cereals, tea, snacks so long as you were happy to add something.
The location of the house was brilliant and we saw much of Madrid on foot. The house was quiet and we were never disturbed by other guests in the street.

I very much recommend staying here and would happily stay again next time I visit Madrid