This is our third Viking River Cruise, and the only that has been affected by water levels. In this case, the level of the Danube was too low for the ships between Regensburg and Melk.
However, Viking handled it well, unlike some of my fellow passengers who for some reason seem to feel Viking can control after levels. We changed mid-cruise from Viking Freya to Viking Njord.
We stayed at the Hotel Mercure in Nuremberg for 2 days prior to our cruise. The hotel was lovely, the breakfast fantastic, and our two tours of Nuremberg Castle and the Nazi Parade Grounds and Museum were guided by knowledgable and personable PHD candidates.
Nicely laid out, but too small, and not at all worth more than a category D.