This was a nice sized room in an ideal location. However it is more like a hostel than a private room in a home - there are other rooms for other people to stay in and the walls are very thin. The neighbours I had were really loud when talking to each other, talking on the phone and when watching TV until 2am.
The room would be fine for a night or two, but there was no duvet, just a sheet and then two blankets and I'm not sure how clean they were. Also there was no mat for the bathroom floor to catch any water when stepping out of the shower. Further it's advertised that there is a TV; there isn't. There's just a shelf where the TV obviously used to sit.
The bathroom was small but fine. There is a shelf above the sink but it wasn't actually straight so everything just falls off it, making it useless.
Overall I'd stay here for the location but would probably look elsewhere next time I visit Madrid.