Check the weather before going; not just for the predictions (seasonal averages), but actual details. We had a delightfully if not surprisingly warm and sunny trip when we were expecting cool and rainy weather. Consequently, we under packed for warm weather (but what a nice problem to have!).
Be total open minded and just enjoy everything Viking provides.
Try for a room with a balcony.
The should have been some sort of quarantine. Too many passengers were sicken throughout the trip
We ended up on the Viking Magni due to an issue with the locks.
I would talk with them several weeks prior to disembarking and have a frank discussion about whether or not you are going to be able to complete the river cruise or if your river cruise is going to turn into changing ships, buses, and hotel/s.
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