I stayed in a Junior Suite on Enchantment. I believe all the Vision class ships have the same basic layout (all Vision class are called "xxxxx of the Seas"). I stayed slightly towards the rear of the ship, deck 8 cabin 8060. Personally I think this was a great location, it was just a few steps away from the stairway and the elevators by the main atrium which is also slightly towards the Aft of the ship. If you look at the ships layout/map when you pick your cabin get something as close to the Atrium/elevators as possible because thats the central location where you get to anywhere you need to go on the ship, main dining room, lounges, casino, gift shops, front desk, etc etc..practically everything is located right there.
We never had a noise problem at all. Couldn't hear the people in the cabins next to or above us and I don't think they heard us. The balcony is well worth the extra dough!! Nothing compares to waking up in the morning, having room service bring you a pot of coffee and sitting on your little private deck and looking out over the island you arrived to silently the night before. We had 3 of us in the room, myself, wife and daughter and our daughter used the pull out couch. She didn't complain about it but even in a Suite you're in pretty close quarters. The room is about as big as a small hotel room. They make very good use of the space with plenty of closet and storage, drawers cabinets even a nice makeup table that my wife used. The suites have mini fridges also. The charge you for all the canned soda and bottled water that is sitting in your room and in the fridge. About 1.50 each, they just bill your SeaPass account.
The Royal Caribbean people that were at the airport checking people in for airport to port transfers told us not to bother getting to port early because there was nothing to do there and they wouldn't let us on the boat (strange comment I thought). But we took a taxi to the port for 8 bucks and arrived there at 11am, went through security, and check in (make sure you fill out your boarding forms online on royalcaribbean.com before you leave!) and we were on the ship at 11:30am, going through the windjammer buffet at 12 noon! Anything else you wanna know just hollar!