If you are willing to search I am pretty sure everywhere you are going has been discussed in some detail.
Have fun. I've been to everywhere you are going and there are so many things in those places to see and do. My least favorite on your list is Nice, but that's just my opinion.
If you want to stop between these places then the train might make that harder. You are covering much ground though, so a rental car may not be best for you.
I would drive, but again that's just my preference; it's not for everyone.
Munich: see also Dachau
Rome: many threads here. The obvious touristy things are not wrong in Rome. 4x4 lived there.
Paris: I think Furnaceface lived there.
Vienna: There was an excellent thread (with maps!) here also.
Venice: Just wander. Get lost.
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