I'm planning to visit Berlin. I'd like to stay in hostel and pay as little as possible. £10 would be an acceptable price, but £20 would be definitely over my budget.
So, can I expect to find something about £10, or at least not more than £15, when I just arrive to Berlin without pre-booking? Or is pre-booking the only option? I've found some hostel offers, but they require pre-paid via credit card, which I do not have.