It all depends on your priorities and preferences, but here are a few generalizations. Inside cabins are a bargain, but if you're the slightest bit claustrophobic you might feel closed in without a way to see daylight. If you're prone to seasickness, a mid-ship cabin on a lower deck will best minimize the motion of the ocean. The good news is that lower deck cabins are less expensive than those on higher decks. Many people say they feel more vibration at the rear of the ship (stern) and more outright rocking motion at the front (bow).
To minimize noise, study your ship's deck plan and avoid cabins directly beneath venues such as lounges, theatres, casinos, etc. Cabins that are placed too close to main elevators can also be noisy.
Have a great cruise and let us know if we can help with any of your other decisions.
What about on the Celebrity line's Millennium? We want a stateroom with a balcony. It seems as though, going with the suggestions from Dawn, we should book a 1B or a 2B. Any thoughts or suggestions?
Typically the lowest deck and in the center, (or midships), is the most stable and on many ships the deck dircetly about that is often sandwiched between to "passenger" decks so they are prettyt quite as well. The aft you sometimes get the engine noise and vibrations and in the bow you WILL hear them drop anchor should they use it. You would also like to avoid being next to the gally or below the disco's. In reality, most cabins are still pretty quite and you should not experiance much if any noise.
Just returned and had cabin 6042 - cat. 2C with verandah. It was perfect; close to elavator but no noise from the elevator crowd. One deck up from the dining room (at the stern), theatre and other many public areas. Neighborhood noise was noticed on both sides and cigar smoke from the adjacent balcony occupant. But I think they were told to quiet down! I have had cabins on deck 5 mid-ship regular outside and was very comfortable. Would not recommend lower, in the bow or the stern (vibrations-doors & draws opening in the night).