Overall, this BnB is in a great location to explore Madrid on foot. However, you do get what you pay for...
Communication for entry was difficult largely due to the translation feature in the AirBnB App, however, after a good 30 minutes or so, we managed to find the right place (Google maps takes you around the corner from the entrance.
The add does state that it is a shared space, but in the days we were there, there was 6 of us Ina very small space, sharing a very small bathroom. If you're all out a lot, you may not notice so much, but it is small. We had what seemed to be the smallest room, so once both our packs were in and the door closed, we could barely, but stand on the bed. However, the real and main issue we had was how hot the room itself got at night. Seriously, even with the fan on high, it was without doubt, 10 degrees hotter in the bedroom, than it was in the room next to us, or the lounge. So much so, that for 2 of our 3 nights, we both managed to get no more than 3 hours sleep each night. Air-conditioning would go a long way here!
So overall, this review receives its stars based on location, cleanliness and price.