The trip passes from Western Europe with its familiar culture,castles and vineyards on the Rhine, across the continental divide via a canal first envisioned by Charlemagne, then down the Danube through Central and Eastern Europe to the beginnings of Asia at Budapest. As an historic adventure I can think of nothing that surpasses it.
The ship and its amenities are excellent. The included excursions are well managed and the guides are knowledgeable. They provide a view into each changing venue of the European mosaic as the ship passes from West to East. There is a small library aboard that provides information on the history and art and culture of each area as you proceed. The food is excellent and the wines are as well. They change with the regions so one can experience both the dishes and wines of each place.
The crew is pleasant and helpful; the relatively small number of guests turns the trip into something like a family excursion. I recommend this trip without reservation. Take some time in Budapest at the end. The city is well worth seeing. Do it on your own; I recommend the Hotel Corinthia.