Given room 719, which is right by the elevators. It was like a freight train was moving past the room everytime the elevator passed floor 7, which as you can imagine was all night long. Tried to phone reception at midnight, got no answer. Reported it in the morning, about how loud everything was (AC was loud too, as it kicked off and on) and she just shrugged and said nothing.
Very disappointed; have since filled in the Hilton feedback form asking for a response, nothing received from it either