Stay away from 6099. It has the loud engine vibration noise going 24/7, which wasn't all that bad - didn't hear any hall noise as the hum and vibration in our room drowned out any hall noise! But in the empty space beside our room, there were high pitched alarm bells going off all day - was finally told they were alarms that went off when certain water tank levels got below where they were supposed to be! I was in two other category 11 rooms near aft (friends rooms) and they were perfectly silent. Guess I would have preferred to be sandwiched in between two guestrooms, but that's just my experience.