Ours was one of many river cruises affected by low water levels on more than one river, but we'd live in Germany during a drought year back in the 70s so weren't concerned. Leaving Amsterdam a day later than originally scheduled gave us another day on our own (Heavy rain would have made tulips + windmills most unpleasant.) and we had one well-organized and well-predicted ship-swap. The logistics of the ship swap were impressive: moving two boat-loads of guests by luxury coaches, moving luggage by truck, cleaning, rescheduling meals & shore excursions.
Local guides (required by law) extremely knowledgeable -- don't be afraid to book your day full. Because we had a 2nd primary Viking staffer, tours eventually split into two groups to accommodate those less mobile (bus access to central town areas limited by ordinances & cobblestones = cobblestones) -- to everyone's benefit.
Notes in no particular order:
Rarely in the stateroom except to sleep but nice not to feel like we were sleeping in the living room. Lots of elbow & "staging" area when planning for next day's shore excursion or coming back after a busy day and getting ready for dinner.
Small drawer./shelving area in closet 90 degrees fm web page diagram, eating into hanger space.
Could use at least one more USB and one more power (either U.S. or European) outlet.