Jo, Maureen, Jools
I did this trip last October and I totally agree with Bosuncat, this was a very enjoyable week away. I'd definitely recommend booking the optional extras to Plitvice Lakes and the Caves, both are stunning and well worth the coach journeys - in fact I'd say all optional extras were worth the money although the Venice trip wasn't available on my holiday (I knew that before I booked as it runs May-Sept I think).
As yes, Tour Manager Vladka is the best - I hope you get her!
Michael.