We chose a Swan cabin on the Scenic Azure on the Douro. I am short, so could not see out the window. Also the cabin on this ship is smaller than a standard French balcony or balcony cabin. The twin beds could be made up separately, but not physically separated. The person on the window side bed could not walk between the bed and the wall. The bathroom was very tiny, especially the shower. We spent all our time up on the upper decks, which is not unusual for a river cruise. I think this cabin would work fine for a single, but it felt very tight for two people.
My conclusion is that I definitely need a full size window when I sail, and my travel buddy needs a larger bathroom. (We visited a "regular" cabin and found the sized much more to our liking.)