For corroboration of this trip review, please refer to the 5/13 review by the person who referred to the Viking Tor.
We arrived in Basel, Switzerland and were met by Viking staff who advised that we would need to board a bus to Germany because the Forseti could not make it to Basel. That was the beginning of what turned out to be a week's worth of stringing along the passengers by moving them through Germany on a bus; always underestimating the travel times. We never left a dock onto the river during the entire week. The review of the Viking Tor is related since at some point, we were moved to the Viking Tor as an interim stopping point. It was docked in a scary industrial port which the bus driver got lost trying to find.
While our fellow passengers were very reasonable in understanding the serious nature of the European floods, all recognized that Viking did little to notify passengers of the risk. They have now offered 75% cruise cost vouchers for upcoming trips. Unfortunately, that amount does little to reimburse the overall expenses of a trip like this.
Before investing in a trip like this, you must consider the risks.