Marco's place is exactly what AirBnb intended its homes to be when this website was founded. It was well furnished and beautifully designed for a large group, with a nice open concept in the living room area, but also plenty of privacy with the bedrooms in the back.
The location in the center of Madrid is ideal for walking around the city, and even came with a washer, which is not always common. As a group of 6, we loved our stay.