I have never heard of a Galley making an undue amount of noise. These threads about certain cabins being too noisy strike me as odd.
The only time i ever had a problem with a cabin that was too noisy was when it was by a service door used by the crew to get into the passenger area. The crew would open the door and let it slam shut - which made a loud banging noise every time.
All I did was leave a note on the door asking them to close it quietly and all was well, within a couple of days some workers came and put a liner on it so it wouldn't slam.
Bottom line - I wouldn't worry about it. There are fully solid walls and a hallway between you and the Galley, I doubt you will hear a single thing.