Hi Marion, the only time we were in Rouen our ship docked out at Le Havre & there was an hour to an hour and 15 transfer fime. The river Seine does run through the city, but I'm not aware that it is deep enough to allow a ship to access the city area, so you may want to clarify that with Azamara.
Rouen itself is a busy city within an ancient surround, with a large number of religious buildings, including one where Joan of Arc was tried if I remember correctly. There is also a very unusual, secluded housing square - it was originally a medieval leprosy hospital.
Walking away from the Cathedral across the square there is a road called the Grand Horloge (or something like that) and down that road is a very large ornate clock that spans the width of the road.
The last thing I remember was the Law Courts where you can still see the bullet holes from WWII street battles, quite moving.
If I can find any pics, I'll post them to the albums & drop another message here.
Alan & Katrina
Last Cruise: Queen Victoria November 2014
Next: P&O Britannia March 2015
Then: Minerva April 2015
and : Royal Princess August 2015