We have travelled several times with P and O and have always enjoyed it . The Ventura is a large ship with lots of separate areas .
Our cabin was on C deck which has extra large balconies . This is really useful in the Caribbean heat as it gives an area of shade and it's possible to stretch out comfortably . All the staff on P and O work tirelessly and are very polite and welcoming . Each cabin has normal plug settings so there is no need to take any adapters . A good tip however is to take an electrical strip if you have lots of things that need charging .
There are white products , shampoo and shower gel available in the cabin in small bottles so these can add to your supplies . We travel in premium seats on long journeys due to medical problems and the extra that this costs is well worth it especially as you get a 28 kg luggage allowance.