We have sailed twice on Oceania: once on regatta some years ago to Greek islands and Istanbul and just last year on riviera from venice to athens. I thoroughly enjoyed both trips. The food is excellent consistent w their reputation. We had concierge- level cabins both times. Although a tiny bit on the small side the cabins were fine for us. I actually cannot think of any particular negative. It s not regent but its not carnival either. It is in my opinion a very well priced product that is accurately in my view described as "regent-lite" I am sure you will enjoy it .
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Helen