The location is great for art lovers- close to the Prado, Thyssen and Reina Sofia. It's close to bars and restaurants. The street noise, perhaps typical of a busy European city continues all night. That, and neighbor noise through thin walls, make sleeping difficult. Headphones or earplugs suggested.
Furniture is old and soiled. Everything provided is the bare minimum. ONE wine glass, no real coffee maker, and a clothes washer that makes deafening noises and vibrates around the kitchen floor. We washed clothes in the sink instead.
The listing suggests the place can host 7 people! Only if three people are willing to share a fold out sofa bed with a broken arm.
With a bit more attention and a modest investment from the owner, the place would be more inviting to visitors. I will return to Madrid next year, but will find other accommodations.