I went on the Venetian river cruise three years ago and enjoyed it so much I booked the Duoru cruise as soon as I got back. Many people were on the Venetian one because they had enjoyed the Duoru.
I was one of the people who asked for more river cruises and will be going on the Spanish river cruise this year, having been too late last year with all places already taken.
I would love to see more destinations for this type of holiday, and look forward to having details as soon as they are available.