Let me preface my review with this: my husband and I are frequent travelers. 11 cruises in the past 6 years -- Crystal is our favorite (have been on Regent and Norwegian too). This was our first river cruise, first time on Tauck.
Communication, Transparency and Customer Service are not Tauck's strengths, from my experience.
When we arrived at our hotel in Budapest, we were told -- for the first time -- that the ship could not get to Budapest due to low water levels on the Danube, so we would be bussed to Vienna the next day. I don't blame Tauck for the water situation, but I was surprised they hadn't shared this info in advance.