My wife and I have cruised 20+ times with a variety of lines - most recently Silversea, Regent and Cunard QG.
We have just returned from a 10day Eastern Caribbean cruise on Riviera - our first time on Oceania. We had one night pre-cruise in the JW Marriott hotel in Miami and transfers arranged by Oceania. These all worked out very well and embarkation was very quick.
Our Penthouse suite was spick and span and a chilled bottle of champagne was waiting. First impression was that the balcony was on the small side but this may have been due to our location - next to stern on Deck9.The ship is less than two years old and was immaculate. We did notice the lack of a wrap round promenade deck so if you wanted to walk on board, it was rather restricted.
A reasonable size with a rather small balcony