If you have minimum needs, this is a very good place to stay at to visit Madrid. It is extremely well located for it's price, in an area where nightlife is at it's peek. The place is cleaned out every morning and the beds are big and comfortable. You don't have anything to cook but you do have access to drinking water, a fridge, a ramen/coffee machine for free, and some muffins for breakfast. They also always leave some snacks on the bed for new comers. These details are appreciated.
On the other hand, they are very strict with the rules , and spend a lot of time reminding them to you as well as the eventual fine fees through long messages before and during your stay. This doesn't make you feel particularly welcome and adds some pressure to your stay. But i suppose this is because they've had bad experiences with other guests in the past.
All in all this place really is held like a business, and there will be no conviviality to expect.
Also, don't expect anything non essential. you won't even have a place to sit down other than your bed. Our beds were in the corridor, but that was specified in the offer and the curtains on the bed made it okay.
But once again, if you are young with minimal needs and just looking to party or to spend minimum time in there only to sleep, it will be a perfect place.
Overall we were satisfied. Thank you for hosting us