I cannot specifically comment on the Norway cruise, but I took the Zenith when it cruised for Croisieres de France in 2016 (CDF is no more - the ship went back to Spanish parent Pullmantur). I took the Pullmantur Horizon in 2017. Old, but both got the job done. If you're worried about restrooms, use the public restrooms except when you go to bed. We never had a problem with backup, ever.

The language thing is only a barrier if you allow it to be. We took CDF when neither of us could speak French, and we had a great time. The Mr. doesn't speak a word of Spanish, and he got by just fine on Pullmantur, thank you very much. The waiters assigned to the international tables speak English, as does the International Hostess and most of the bartenders. The daily bulletin is published in small numbers in English, or you can make a bilingual friend on the trip.

Be daring. Make it a vacation to remember. It isn't the destination; it's the journey.