Hi there, Annie's question was also the first thought that came to my mind. So whilst we await that I'll just throw a couple of comments in....
As you will be travelling pretty much Norty/South or South/North, then sailing into the won't really be an issue, but you may want to think about port or starboard so that you get either the morning sunshines, or afternoon/evening sun.
The river that you will be sailing down are fairly narrow, so the scenery will remain fairly similar along the route, and if you are on deck, then you get to see both banks of the rivers.
The question I would be asking myself is, if I was to add a couple of days onto the end of the voyage, then would I prefer to spend that time in Amsterdam or Budapest, and of course that depends on what your interests are.
Hope that gives you some food for thought,
Alan & Katrina
Last Cruise: Queen Victoria November 2014
Next: P&O Britannia March 2015
Then: Minerva April 2015
and : Royal Princess August 2015
Golden, Grand(2), Caribbean, Sea(4+1 aborted)
Adonia(4+2), Arcadia, Artemis(2), Aurora(5), Azura(2), Oceana(3), Oriana(11), Ventura(2), Victoria(5)
QM2(2), QE2(9), QV(6), QE, Caronia(2), Minerva II, Fred.Olsen(8), NCL Jade, =X= Eclipse, HAL Ryndam, Aza.Journey