Let me start off with saying that the location of this place is excellent! If you're looking to be in the center of the city, walk everywhere, and experience how lively Madrid is, then this is the place for you. Also, the host gives you great recommendations for places to see and eat, including a map which is amazing!! The place is clean, has a nice shower, fast wifi, and is pretty safe. If these things are important to you then this place is great!
I will not knock off any stars for something that only I or a certain population is particular about-- but I really don't like dark places, which from the pictures doesn't look like it's the case with this listing. However, the place is dark & kinda damp, but due to the location of the window it's hard to have the windows and/or blinds open. This made me uncomfortable personally and if anyone else has a weird thing with dark places then this is not the place for you.