Each time we've cruised we got a table for four. We didn't request that but it worked out each time that it was just our family of four sitting together. There appeared to be several other tables of four - whether the foursome was together or two groups, I don't know.
As for cabins, last October we were in 6608. We liked the location near the aft elevators and not too far from mid-ship. I did notice some ship noises (joints creaking, noises in the wall, etc.) but that was our first cruise and maybe it just seemed a little loud. Also, we had some strong weather that rocked the boat and that may have emphasized the noise. Was it unbearable? No, but when we cruised in January I did take earplugs to wear at night and a CD player to have some sound as we went off to sleep.
ENJOY!!!!!!!!