This was our first Oceania cruise. We were treated like royalty from the moment we boarded. Our Penthouse 3 was as delightful as advertised. Only problem was "their" hairdryer didn't stay in the plug, but I had my own, so no problem. The bed was so heavenly, we are actively seeking where to buy one. The bathrooms are outstanding with actual storage for your "stuff." We were on Deck 10. Other reviewers have mentioned an issue with Deck 11 due to the overhang above it, and I agree. I would not book Deck 11 on Marina or the new Riveria.
I had thought I wouldn't like having a butler - wrong! Bosco was terrific. He saw to it that we ate in the specialty dining venues as many times as we wanted. All were great, but I think we liked Toscano best. We took advantage of both "La Reserve" and "Privee." At $75 each, La Reserve is well worth it, both for the wines and the superb food. Privee, though pricey, is so over-the-top that a special occasion may warrant the $1000 for 8 that it costs. An additional 2 dinners were extra special for us: dinner with the captain one night, and with several of the performers another night.
Without question, the personal attention of the crew was what made this cruise. The ship is gorgeous - tasteful but not ostentatious - but the attention to detail is what put it into the 6 star category for us.