I have travelled with my husband, we got a "premium cabin" thinking that the amount you pay more than a classic cabin, is worth the expense. We got a cabin right in front of the hot tubs engine room: a constant loud engine whining from 07.00 until 21.00hrs.
The cabin crew : spectacular, even if visibly reduced, they managed to clean and very well our cabin twice daily, finding also the time to make towel animals.
The restaurant crew : same as cabin, very kind and helpfull in everything. Still try to sell you bottled water when the normal one is perfectly ok.
it is in front of an engine room, very noisy. The whole ship has a vibration that is felt more in the aft section, lower decks vibrate more.