The front of the ship is more prone to the motion of the ocean and if the sea is rough, you'll feel it up there more than any other place on the ship.
If you're inclined to get motion sickness, this is not the place to be. If it doesn't bother you, then go for it.
Carnival is very slow to put out the stabilizers when the sea gets rough, so we've always felt the motion more on them than other cruise lines. But the smaller older ships are going to be affected by any rough waters more than the newer bigger ones.
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Especially, if you're on a lower deck, those forward, porthole cabins can get VERY noisy when underway. The waves hitting the hull can sound like cannons going off. Also, when going into a port where you will tender in, the dropping of the anchor can raise the dead. WOW, what a noise that is.
I personally, haven't found the motion as much of a deterrent, as the noise.