Having traveled Western Europe extensively, one thing high on my bucket list is a European River Cruise.
The beauty of a river cruise is that you get right into the heart of most places you visit. You pack and unpack once. All meals and most shore Excursions are included.
AmaWaterways is a family owned and operated company. They own most of their ships. The service is first class.
One gets to experience things you would not get to do on your own. Visits to private castles is one. One visits great places during the day and cruise at night.
What you will see in one week on a River Cruise would be difficult to do on your own. To extend your vacation consider doing a pre and or a post cruise extension.