We have stayed on Decks 1 and 2 several times.....Deck 1 is fine for the poster who was asking about it. There are less guestrooms on Deck 1 than other Decks but that just means it is quieter...not a problem. Deck 1 does have 2 smaller portholes instead of the one large porthole that are found on Deck 2, Cat 9's.
Cabin 2546 is one of my favorite cabins....have stayed in that cabin for 3 or 4 cruises and love the location.....just a bit forward of the mid-ship stairs, elevators and so convenient to everything onboard....need to get something from your cabin or to put something back in your cabin while you are at dinner...no problem...just a quick run to your cabin and you are back in action.