I’ve stayed at Generator two times while in Madrid. I’ve met and shared rooms with cool people from all over the world. I was in coed rooms both times. There is a toilet, shower, and sink in each room. There are more showers outside your room too.
The AC and clean white sheets feel great and the WiFi is strong. You can hangout downstairs at the restaurant or on the rooftop bar.
Best thing that happened to me… I forgot an item after I checked out. 3 days later I went back for the missing item. Generator had it waiting for me. Labeled with my room/bed number and everything :)