Hi Mikenkim - I live down in Mississauga - small world eh? lol 
As for picking your stateroom, go back to the deck plans and see what is above the stateroom you'd like. I found this out reading Seauonboard.com and was able to pick 8234 on the Spirit with the Lido deck above me so no noise at all.
On the Dream I am on the Spa deck with the Serenity Area above me - not likely any noise there either..lol Just a suggestion, even though nobody stays in their rooms, there is nothing so annoying as having somebody banging around 'upstairs' while you are trying to sleep.
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Carnival Dream April 17, 2010
Carnival Spirit May 14, 2008