At 4 am when we have been sleeping for long time, there was another guest from another floor pressing my door bell, claiming that I made noise. I was deeply concerned about the security - A guest from another floor is supposed to have no access to my floor but he did. The front desk opens only till 23:30 so no one can help sort things out.
When I complained to the front desk the next day, the front desk blamed me for making noise - but the things I did during night was only normal things people will do in hotel, shower, going to toilet and sleeping. The front desk did not only ignored my security concern but also blamed me for things I didn't do.
Or the sound proof of this hotel is extremely bad, making shower, toilet or even sleeping something that can bother the guests downstairs.