We sailed on the Riviera from Rome to Barcelona.
Some background: we ar a couple in our early fifties from Canada. We sailed previously on Celebrity, RCI, Princess, HAL, Cunard, Costa and Carnival. This was our first Oceania cruise.
Things we liked:
Embarkation was very smooth and quick. Literally few minutes we wee on board.
The size of the ship is perfect. Not too big and not too small. No lines, not crowded.
Food is outstanding. Definitely few levels above Celebrity or Princess. Specialty restaurants were excellent as well.
Service is excellent. Very efficient and quick. Room is cleaned very fast. When we go for breakfast and come back after half an hour, it is already clean.
No formal nights which is perfect for us. At the same time people dress up nicely, you won't see short on dinner or evening show. Very relaxed atmosphere.
Open seating at dinner. You can select if you want separate table or share with someone (perfect for those who want to meet new people).
No lines at all. Never an issue to find a table at buffet or at the pool.
Free soft drinks, soda, water and specialty coffee and tea.
Free internet (more about it later).
Most of the excursions were very good. We asked to change couple tours, no issues, even after we missed the deadline. I like the flexibility. Also booked three specialty restaurants, asked to change all three reservations. No problem. Really liked the customer service.
Things we didn't like (or liked less than Princess or Celebrity):
Entertainment is good but not as good as on most big ships. Guest entertainers were excellent, but the in house cast has some room for improvement. The theater is relatively small, with smaller stage, so don't expect those big shows with acrobatics that they have in big stages on Celebrity or Princess.
Not enough activities during the day (maybe related to the fact that there are no sea days).
Basic free internet is very slow, almost useless. If you want to be able to do anything, you need to upgrade. Upgrade is $10/day which is reasonable, but the speed is still pretty low. Not the worst I experienced at sea, but one of the worst. For a company like Oceania, it is hard to justify such poor internet experience. 1.5M download speed as measured by Speedtest on the pool deck. This is pretty miserable I would say.
The inside stateroom that we booked is very small. Which is not a big deal, but the shower is ridiculous. Really uncomfortable. This was probably the biggest issue on this cruise.
Spa: we did couples massage, which was good but not great. For $320 plus 18% service charge, we expected better.
Overall great experience. Definitely few levels above Celebrity or Princess.
Cabin was ok. Pretty small, but not a big deal. Shower terrible. Very uncomfortable.