Just finished two back to back river cruises..one on the seine and the other on the Rhine with two different cruise companies. We had 4 Covid cases on both ship. That we know of. We’ve done 12 river cruises over the years and had credits that had to be used before year end, so we took the chance. It was our choice.
Seriously, these were not the most enjoyable cruises. We agreed we’d be very Covid conscious. Wear a mask in doors and in crowds, we wouldn’t do excursions on buses just guided walking tours around villages and tried to distance. Meals were a nightmare! A couple of drinks in and everyone was shouting. Not many wore masks even after the cases were went public. On one ship the staff wore masks, mind you not properly, the other didn’t at all.
Fingers crossed we did enough to avoid the virus. We had done these itineraries before so it was nice to just get away.