My wife and I sailed on the Avalon Tranquility II April 18 through April 25, 2015. It was a North bound sailing on the Rhine from Basel, Switzerland to Amsterdam in the Netherlands. The Tranquility II was launched on April 2, 2015; this is was only the third sailing of the ship. This was our first river cruise.
Overall, the cruise and the ship were fabulous. The crew and the service were fantastic…especially the cruise director, Karolien.
Interesting guide. I found it strange that the Avalon guide could not take us into the cathedral, but the Viking guides did lead their groups into the church.