I think the problem was that he was in a hostel room and that the cleaners knocked a few times - probably to ensure that the room was empty - before going in to clean, as is the practice with hotel/hostel rooms the world over. Since the guy apparently did not respond to their knocking on the door they must have assumed the the room was empty. It appears that, when they did go in he was in a state of undress and made no attempt to either stop the activity or to cover himself up. That would be cause to cite him for a breach of the peace, not the fact that he was banging a bike.