I booked one bed in a 6-bed room, however we were actually 7 in this room. A little mistake in the booking system. I was not the one who had no bed, but I've been woken up at 6:30 am so the person in charge could check my reservation. I already had awakening...
On the other side, the person at the reservation when I arrived was very friendly and he helped me a lot. I needed 1,50 € for finalazing the reservation, which I hadn't, and he found a solution to go through this problem.