Francisco Bacete Menchón
Google
Rooms - A bunk bed, a desk, a window, two power outlets and a bathroom. Simple and no luxury. Beds were comfy, rooms were clean and clean sheets were provided, shower functional, etc. We were unlucky and the toilet was not working but the ones on the hall were clean.
Breakfast options were reduced to basically oatmeal or toast with coffee, tea or orange juice. Good enough.
Kitchen is available to use for anyone, but it was disgustingly dirty in some areas. Grease and oil everywhere, some sinks piled with dishes... There is a fridge for guests and a corner where you can leave your unused food for anyone to take. I swear most of it was rotten with whole civilization of microorganisms and bugs living there.
There is locker service in case you have a late night bus or flight out.
Price wise there's nothing better in the city, and you can go in and out 24h. Leaving aside the kitchen and lack of any luxury, it's the perfect place if you need a decent place to crash for a few days and you're in a budget.