The company we chose was Uniworld - based on recommendations from friends and some special 'last minute' discounts for cruises starting in September. The 17-day cruise we eventually signed up for was on the "River Princess" from Paris to Vienna, including 2 nights in a hotel in Paris at the start, the coach transfer from Paris to Trier where the 'river' part began, and the 15 nights on the 'boat' (this is the term Uniworld uses for its vessels, and I will do likewise). This boat can accommodate a maximum of 136 passengers. The cruise passed through four rivers - the Mosel, Rhine, Main and Danube, and one canal - the Main-Danube canal built as recently as 1992.
In summary, we couldn't have asked for more! Uniworld claims to be a "boutique" operation, and while there is no ready definition of what this means, they really lived up to our expectations of personal service and catering to individual needs - which the big ocean cruise lines cannot possibly match - or even come close to. If you want to find out the details which led us to this conclusion, please read on.
Staterooms: Definitely smaller than on an ocean cruiser, but all the basics were there and the quality of the beds, sheets, duvets and towels couldn't have been better. The toiletries provided were from L'Óccitane and the shower mixer was thermostatically controlled (a step up from the common hot/cold mixers which never seem to be able to maintain a constant temperature). There were five categories of staterooms starting from Cat 1 to Cat 5 and included 4 suites. All staterooms were the same size (except for the suites) and the main difference was deck level and the size of the window - ranging from a shoulder high narrow window on Cat 4 and 5, to a floor to ceiling picture window in Cat 1. We had a Cat 4 stateroom on the lowest deck and did not hear any engine noise or vibration, and hardly felt any movement. The only 'disturbance' came from fellow passengers having noisy conversations in the passage way!
Stateroom was very small and the bathroom was tiny. But these were completely offset by the other benefits this cruise provided.