I stayed for 4 nights in Irene's room. I never saw her because she was travelling but the communication with WhatsApp was perfect and I easily got the keys.
The room was small and full of with her private stuffs but for me with my small backpack was enough place ;-). The room was in a shareappartment with another 4 really friendly people. The common eara in apartment was for a share flat clean enough. And the kitchen big and perfect for cooking. The place was really quite and close to the famous places in madrid.
The only negative point was there wasn't any air condition or ventilator in the room.