This place is in a great location for a very good price. The hosts maintained a very clean space and I felt safe staying here as they gave a you a separate key for your room and the building was very secure.
My only complaints would be that the room got quite hot when the door was closed because limited AC entered without the door open. Also, although the space is secluded from street noise, there was still quite a bit of noise from renovations of apartments below and loud conversations from neighbors. This of course is out of control of the owners so I don’t blame them and this may not be the case during your stay, but I would recommend bringing ear plugs just in case.
Overall an incredible stay and I would definitely recommend it! I even booked it a second time for when I come back to Madrid in a month.