Ama Viola - Iconic Christmas markets

Hello all, first Europe river cruise this December on Ama Viola - Nuremberg to Budapest. Anyone done this ?

Have read up a lot since booking a few months ago. Want to hear from anyone who has done this particular cruise. How rushed are the days in each port. Considering the theme is Christmas markets, how much time do we actually have in them ? Travelling with a 4 year old too. Any general tips ?

You may also want to check out the River Cruising forum: https://boards.cruisecritic.com/forumdisplay.php?f=191