In a word Fabulous. Although there was a low water level situation in all of Europe in almost major rivers that we went through, Viking ( not their fault water is low ) made the transition seamless. Yes, we have to change ship twice and it entailed packing and unpacking, But Viking, for the first time in their history, made sure that the same crew came with us until the end of the tour. We have the same Program Director, all the dining staff, and the Room Stewards. Concierge and Front Desk people. Their services were impeccable and utterly professional. The passengers had no cause for complaints. Viking even gave us a 15% voucher for a future cruise, a free Vienna Chamber Music concert. I sure am going to use Viking again, Tip: Viking has the world's largest fleet of river ships. In case of need of ship swapping, there would always be available similar ships to use, What more could you ask ?