My very first cruise on the Wonder was in 6105 and I don't remember any issues with it (i.e. noise). My one sister was in 6103 and the other was in 6101 and they never mentioned any issues.
That being said, I've stayed multiple times in 6099 on the Magic (room lay outs are identical on the Wonder) and love it (and just booked it for my NYC sailing)! My DS and DIL stayed twice in 6101 (on the Magic) and they have never had any issues either.
BTW - 6099 is next to 6101 which is next to 6103 which is next to 6105 so they are all in that general area on the same side of the ship.