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Should be cheaper than 2 balcony cabins. It depends on how "friendly" you are with the each other. There may come a time when someone wants to retire earlier and not be awakened by others returning late from the casino say. It's also important that before you book, you decide that It's no more of a big deal than any other type of foursome holiday except that, if you fall out, you can't change rooms. You have to put up and shut up. Decide before booking that you will be free to do what you like when you like, rather than follow each other around like annoyed sheep.