Some of the older ships this is inevitable as they are not fitted with the new type propulsion gear, so you need to think a bit bigger to get away from these sort of problems there are plenty to choose from Celebrity; Royal Caribbean; Princess etc
I know small should be beautiful but on the older type ships it spells problems, OK if you are a good sleeper, but if a light sleeper not very pleasant.
I fear that you may well be jumping from the frying pan into the fire if you are trying to avoid vibration. Just in case you haven't already noticed. These ships are twins! Both originally built for Holland America Line by Chantiers de L'Atlantique (the same builders as the QM2)in France during the early 1980s. The Spirit is actually a year older than the Celebration! Unfortunately they were a new design, and not very well built. Consequently they have both suffered from very bad vibration since new, especially at the stern. Maybe you should have another think? Happy cruising.
We have just come off the celebration.its the pits.to be honest we have cancelled a cruise on the destiny.in our opinion all thomson ships should be scrapped.they vibrate and are tatty,very old,a hi de hi 1970s butlins type holiday.try a princess cruise and you will never step on a thomson wreck again.you will have no regrets .
Having been on both thomson and princess dont agree with this at all thomson far more friendly far better entertainment princess tips are taken of every day $10 P.P so staff dont have to be so friendly very snooty to say butlins type holiday!