There was an extremely loud noise coming from the pipes in my wall starring at 5am every morning. The building has an old steam heating system, and when they turned it on the clicking noise made it impossible to sleep, even with earplugs in
I told the front desk 3 times. The seemed to know exactly what I was talking about but didn't offer any sort of solution. They said it "would eventually stop."
Otherwise the room was clean and the location is pretty good.