I would favourably compare anything on Viking with any ship I have been on. Almost 30 cruises from Canberra to Azura.
The whole ambiance is so much more relaxed.
No airline style security getting on or off. The Mateus tour for example they spit us into groups off 10 instead off trying to get every one through as one group things like that make a huge difference. Cold drinks and refreshing towels on return from trips etc.
I could go on but I think you will get the picture
Hi I have only conducted two river cruises and one was with Viking. I enjoyed both, The Viking cruise (Rhine) was more expensive but the food was much better than my on Nile cruise (Thomson). The emphasis is on the destinations rather than the facilities/entertainment offered onboard. As you are aware river cruising is more expensive than ocean cruising but more is included (excursions, drinks etc). If you have extensive ocean cruising experience the "new" destinations offered on river cruises offer a welcome relief to the same ports most ocean cruise lines visit. If you don't seek lively evening entertainment then I cannot see any reason why you wouldn't enjoy this type of vacation.