Hello RollWave,
We love the smaller Oceania ship, the Insignia. Since it's a smaller ship, it can go to ports closer to city centers. The crew and officers were wonderful. The food was truly the best cuisine at sea. We were on her for 28 days to Southeast Asia in an inside cabin in 2017. We were on deck 8. All we had to do was go up one deck and we had access to the Terrace, Waves Grill and pool area and sea air! The cabin size was a non issue for us. A bigger shower area would have been nice, but not a deal breaker. We actually loved the lectures on board, the Afternoon Teas, and the low key entertainment.
We have also been on the inside cabin on deck 8 of the Nautica for 18 days. We have also been in a penthouse on the Marina and Nautica and concierge veranda on the Marina and will be in a concierge veranda on the Riviera next year. IMHO, one can't go wrong on whatever cabin you choose.
Enjoy your cruise!