Fine apartment in central Madrid, great location, right in the middle of the Malasana party neighbourhood, 1 minute from the metro. The apartment is small, good enough to sleep in but probably not to stay in over the day, but still value for money. The main bed is great; however, the sleeping area for the other 4 people is tight, not great for tall people, but the mattresses were fine. Bathroom is fine, with shower gel, towels, soap, appreciated the hair dryer. The kitchen is equipped well enough with hardware but not for cooking, there was no bottle opener, no extra bin bags and no basic stuff like oil, pepper or coffee (only salt). We appreciated the self check-in by lockbox, since we arrived around midnight. The light is also not fantastic, since there are only two small windows. As I said, good for sleeping, not great for staying in over the day - you get what you pay for.
One more thing, the AirBnB app said checkout was at 12:00, but the cleaning lady came at 11:30 and said we should have left by 11.