People reported success in securing a room quickly by hanging out in the lobby in a very unorderly way. The golden line between being a nuisance or casting a negative image without actually giving a reason for complaint, such that the hotel only has one choice to get rid of you: find a room for you as soon as possible.

Please note, however, that the correct way of action would be to simply accept that they can't / don't want to give you a room until the official check-in time.

HTB.