Check bunkhouses booking situation with the portal below. Book a bed for you for the desired time. Booking can be done 1 month in advance and maximum length of one booking is 14 days. Check-in and check-out time is at 2pm.
The calender for bookings is here.
Bunkhouse costs 7€/person/night which you pay at manifest. Price does not include pillow, blanket or linen so bring your own or you can purchase them in the manifest.