Weve stayed in 2135 & 2137 before and we liked the cabins and the location. The inside cabins are the same size as the outside cabins but I like the layout of the inside cabin better. The location works great and since there is very little hall traffic, there are no noise problems. Except on our side of the ship (Starboard) we had an equipment room across the hall and a motor or pump or something would run for about 15 seconds 4 or 5 times a day (and night). It wasnt real loud, but with the room being so quite, it was easy to notice. You might not be able to hear it at all on your side of the ship. But I would take that over the hall traffic noise you get on other areas of the ship.
I think youll enjoy the cabin, but in my opinion there is no such thing as a Bad cabin on the Magic or Wonder.