Is it possible to upgrade after final payment?

I'm booked, and fully paid, on The Horizon in Europe this April. I'm travelling with my husband and our 20 year old son and we're booked in to an 4B interior cabin, down on deck 1. (I know we will cope okay with that, and our son is mildly autistic so we need him to be in the same cabin as us.)

I've heard on various forums that the 7 day European sailings still have lots of availability and wondered if anyone has any advice about the possibility of us getting a bargain upgrade?

I really don't mind interior, as I find I sleep very well in them, but would ideally like my son to not be on an upper bunk - anyone know which cabins would have a sofa bed or such, without breaking the bank?

I will probably phone Carnival, but thought I'd ask here first so that I know what to ask for :)

ETA - I booked direct with Carnival, paying in British pounds, if that makes any difference

Yes you can upgrade by calling carnival... it's in the FAQ page somewhere, but that's how I had to do it after I paid.

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They are always happy to take your money

Give them a call. They will allow an upgrade and they can suggest which cabins have the sofa bed (Safer getting into and out of in the dark for the bedroom).Most, if not all, oceanview cabins will have a sofa bed. All balcony cabins will. Deck 4(main deck) and above will have less engine noise when trying to fall asleep. And you should not hear the anchor when docking in port early in the morning while still sleeping.

With cash in hand and availability you can always upgrade.

We love the ocean view deluxe rooms on deck 1 and are booked on the Horizon in April, too. They are only slightly more expensive than an inside.

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Thanks all :-) I phoned Carnival, with a set budget in mind, and I bagged myself a Cove Balcony! Much happier with that, than worrying that my 20yr old son would fall out of the top bunk bed!