Main concern I had was when I woke up the next day I had itchy bug bites. Could be bed bugs or something else but now having to deep clean all my luggage just in case it’s bed bugs.
Place doesn’t feel like a standard Airbnb, more like a makeshift small hotel. As others mentioned there is a hallway with a bunch of rooms that other travelers stay in.
Location is so-so. Convenient if you need a quick place to stay in between train and airport travel, as I did. But less so for typical Madrid tourism in which you would want to be much closer to plaza major.