We just returned from a 35 day cruise on Oceania's newest ship - Sirena. This is actually one of the old "R" ships which Oceania has 3 of already. Sirena is now the 4th "R" ship. When Oceania took over this ship from Princess, it was in deplorable shape and underwent a massive renovation.
Horizons was redone completely opening up the room making it more functional. Princess had added men's and woman's bathrooms which is necessary as the old "R" ships don't have a bathroom on the 10th floor and one has to walk down one flight. The room now is much nicer. I hope they will add bathrooms to the other smaller "R" ships.
The Penthouse cabins have been redone. The bathroom which had a small shower and tub, has been upgraded. They took out the tub and shower and made a much larger shower, which is great. We unfortunately were in one of the veranda cabins which doesn't appear to have been updated. But we visited a penthouse and the occupants really enjoyed the changes.
Our cabin needs to be renovated. The furnishings were scuffed and one of the drawers had come apart. This was corrected as soon as I called it in. The sofa bed cushions kept sliding forward. We were not successful in our attempt to fix this. Finally halfway through the cruise after a second complaint about it, one of the staff came in and took it completely apart and reset the cushions. I will make sure not to book a room in the future that has a sofa bed. The room was small but adequate. Lots of space for 35 days worth of stuff. The furniture on the veranda looked new; nicer than the other "R" ships. But the other furnishings were not in good condition like the other "R" ships. Something strange about this ship - occasionally the water from the sink came out brown. I put a washcloth under it and there were dark brown spots on the cloth. I asked about this but was not given an explanation of why this was happening. And I don't know if it was corrected. But other CC members complained of the same thing in their cabins. The carpet did look new so maybe some renovations were made.
The mattress was not up to Oceania standards as when you sat on the edge, it sank down. I don't remember this on the other ships.