It is an enormous advantage if you can speak Italian, especially in Northern Italy.
I don’t know the specifics of the program, you can post questions through their website or Facebook page: Politecnico di Milano
They just had an open day for the Master’s so there are probably people to answer your question there.
Given the language barrier I would go for KISD out of those three. It is quite German in approach non-surprisingly so you will have to be aware to develop your own designer profile. Cologne is a great city and with public transport you can visit a lot of places. Job prospects will be good with Germany being one of the biggest economies.
Have you considered the program of Eindhoven University of Technology in the Netherlands?
Their approach to design is very innovative and the program is fully in English with a very international teacher staff.
https://www.tue.nl/en/university/departments/industrial-design/education/industrial-design-graduate-programs/industrial-design/