We cruised for about 3 days, On buses the rest of the time. Be cautious if cruising is a desire. We unpacked 3 times. Our Cruise started at a hotel in Budapest (Corinthia for Fri Night) rather than a Longship. Lots of bus rides between docked house boats. What a joke for a cruise.
If you want a bus tour through the Danube towns then this is for you. Viking Management knows all of this so they have seemingly stepped up the advertising to booked their ships years in advance.
Viking does take care of you but things are deceiving as there it n0t much of a cruise due to "low water levels" but the levels have been low for months and they send you an email the night before you depart like it is new news. They say they hold out hope for rain but it would take a hurricane to make a difference.
Will only review two port stops as the others ranged from OK to non-impressive (they were all of churches). Regensburg was an unexpected surprise and worth seeing. Lots of history, architecture, and a complete med eveil town undisturbed by any of the wars.
The town and city tour were just Ok but the optional WW2 Tour was well worth the time. It included stops at a couple of historic sites, buildings, museum, and the courtroom. Well worth your time.