Rooms are relatively small, which is to be expected, but our room, a balcony room with a king-size bed formed from two singles, plus a single bed formed from a "sofa" (the bolsters were tucked under the king), was snug but adequate for three. Tip: The balcony was worth the money, as it added some very pleasant space and allowed people with different sleep schedules to stay or get up while the rest of the family slept. The balcony is lighted, so people can sit on it to read or talk quietly without bothering someone inside. We had intentionally chosen a hallway with staff areas rather than guests across the hall and at some distance from elevators, but there was still plenty of traffic going by. Nevertheless, we were not bothered by noise either from the hallways or neighboring cabins.
The cabins are supplied with shampoo and shower gel and a built-in blow dryer, though our blow dryer didn't have a lot of power. If you have lot of hair, you may want to bring your own blow dryer. The one major deficiency of the room was dearth of electric outlets. There is ONE double outlet, and one of the outlets is a 220 volt for overseas visitors, a nice touch for them, but a problem for Americans. Like most Americans, we packed a variety of electric appliances--e.g., curling iron and straightener--and items that needed to be charged: camera batteries, a laptop, cell phones (not that they functioned most of the time), etc., and keeping everything charged with just one plug was a juggling act. Tip: If you've travelled overseas and have a converter, bring it with you, or--and I'm sure Carnival won't like this advice--a small travel size surge protector to give you more outlets.
One rather odd feature of the room is its safe. For reasons that I can't begin to explain, the safe is locked and unlocked by your credit card, which doesn't do you a lot of good if you want to use the safe as a place to PUT your credit cards and such, since after all you don't need to carry cash or credit cards while cruising. So I guess here's a tip: bring along one useless or expired credit card for this purpose. Of course if it's stolen you're still out of luck getting at your valuables in the safe.