Paper thin walls and an idling bus daily outside the window
Walls are so thin you can hear people in the bathroom next door as well as snoring.
There is some type of large bus parked outside the right side of the hotel from 5:30am-ish to 7:15am with its engines idling which causes a vibratory noise in the room. Its awful. 
All the lighting is bright flourescent. Energy efficient...I get it but don't they have subdued energy efficient lights these days? Service was so-so. I mentioned the bus and they rolled thier eyes.
The HVAC system is loud and terrible.