Cabins 7129, 7125 : a loud mechanical banging noise near the rear wall ceiling, starts randomly at about 4:00am and continues until the late morning. HAL could not identify the cause and we were moved after 5 sleepless nights. Cabin 5024: the air-cond was broken and was stuck on the coldest setting. It was like a meat safe and is impossible to sleep. I believe the Front desk already knew this room was problematic, but still moved us there. Both moves we had to do ourselves with no assistance and this wasted two mornings. Our final cabin, 6136 was great - we finally could sleep after 6 terrible nights.