Nanni,
We had a stern cabin on the Conquest on the Empress deck. All the cabins are the same size, which is comfortable for two. We didn't have any noise problems after our neighbors closed their door during their sail away festivities. On the upper deck I wouldn't be surprised if there was some noise in the cabins above the Degas Lounge when the band is performing. Nice band by the way. We only noticed sea motion the night we left Cozumel. Apparently there is a coming together of currents there and it is not uncommon to have some seas. I will say it didn't seem any more pronounced in our cabin than it did anywhere else.