My wife and I purchased a river cruise package from Scenic which including the airfares cost over $60,000. This was a Paris to Paris cruise along the Seine followed by a cruise from Amsterdam to Budapest with an ad on in Paris at the beginning and an ad on in Prague at the end.
The first cruise along the Seine was enjoyable as the ship sailed mostly in the day and moored at small French towns during the evening in contrast to the second where the ship sailed mostly at night and moored in industrial areas a lot of the time.
The cabins were fine and as traffic on the Seine was not as busy as the Rhine we did not have to raft up with other vessels when mooring unlike the Rhine.