I desperately want to write between deck 5 and deck 7....
I would suggest obtaining a brochure where all details of the ship, cabins, facilities, public rooms etc are located. Its actually fairly central not too many floors to most activities.
Oops, Mr /Mrs Smithson, I had the urge to say that too.
To amend for my earlier answer here is the deckplan http://www.cunard.com/QM2/DeckPlans/deck_frameset.asp?Active=onboard&sub=deckplan.
Me too!