I have 17 nights and would like to visit at least 5 European cities/countries that are relatively homogenous with nice art/architecture/history and reasonably logistically convenient

Must see: Budapest

Choose 4 from these options:
-Warsaw or Krakow
-Prague
-Vienna
-Munich (would like to see one German city and it's convenient, same with Vienna)
-Croatia
-Bucharest
-Other Balkan countries