I can put up with overhearing noise during waking hours, but if I'm trying to sleep, I will call the front desk and ask them to call the people in the room who are keeping me awake. I always emphasize that the neighbors aren't doing anything outrageous, just that their talking or their television is coming through louder than they probably realize. This usually does the trick. I call the desk because as a woman travelling alone I don't want to knock on a strange door at night.