Britannia is a lovely ship but lacks the Wow factor of similar sized ships such as Celebrity's Solstice class. We had a basic interior cabin on A deck, about which we were quite happy, as the design was fine, and our cabin steward was excellent. We had no problems at all with noise from above, as noted by another reviewer.
We dined mainly in the Peninsula Restaurant where the food was excellent. Food in the buffet was not so special and the area was always too crowded.
Theatre shows were excellent throughout, though so popular it was necessary to be seated well before the show or miss out. Most shows were on three times each evening.