There are a lot of great suggestions here but I did a couple of short European trips when I was young and it is really physically tough so to minimize your exhaustion I'd pick something in Western Europe that you can reach non-stop so you have 1 flight and you are done travelling - that means London, Paris, Amsterdam, Brussels and maybe Dublin or Madrid.
There are non-stops to Vienna and Munich but it is further but connecting to Prague, Athens, Istanbul etc will add another 3-4 hours to your travel time and I would not then add driving on to that.
I think Amsterdam is the best of the suggestions so far but think you will find great stuff to do in any of the suggested cities.
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