we have a small travel iron I bring they request you not bring them on board safty reasons , but if you are real careful always unplug and put it away in closet, they do have laundry room on board with iron and boards and they have a laundry service also they run specials on the 3 or 4 nite out for laundry service washers and dryers run 2.00 each need quarters for them dryers run about 35 to 40 min
it is not allowed to bring or use irons in the cabins for fire safety reasons. However, Carnival's ships have self-service launderettes including irons and ironing boards.
Oh, and while irons of any kind are prohibited, steam-only devices aren't.
there are at least two lauderettes per ship. It depends from ship to ship where these are located. They can be found by looking at the ship's deck plans.