My first river cruise, but have traveled a lot with Tauck, so I had the Tauck high quality/service expectations going into it, and they were met. They have a quality crew partner in Scylla and to the casual observer they seemed to work well together.
I've only been on a few small-ship cruises, but felt that the cabin size and storage space were more than adequate (though I travel with only a 22" suitcase and a backpack). The shower was excellent--good water pressure and no sharp edges on which to bang elbows. Good ventilation, too; could wash out "smalls" in the morning and they'd be dry by the end of the day.
Tour was Tauck first class. Nice shore excursions most days, always with the option of staying on the ship, and often with the option to either return to the ship for lunch after a morning tour, stay in town for lunch and return at around 3, or even to head back into town for a quick visit after lunch. Very accommodating and flexible, with their own coaches (with bathrooms) and great drivers.
My Highlights: Trip to WWII cemetery in Luxembourg, Baden Baden--nice sized town but not overwhelming, the amazing vineyards along the Mosel, the smaller towns along the Mosel (Boppard, Cochem, Bernkastel), the fact that there were no add-on charges, excellent food with wine included at dinner. Quality of Vox sound box.
Tips/Notes: Fun to eat at least one meal back in the Lido bar; smaller, more intimate, able to see a lot off the stern. This ship will be moving to France for cruises there starting in the fall, and this tour will get the newest ship in the fleet. Some of the Scylla crew will join the new ship, some go w/the Emerald