Well, it depends on exactly where you plan to spend your time and other details, but...I have to say, this sounds like a bad idea to me. And I like my car.
In many of the places you mention, having a car is going to be an major expensive headache. Don't overlook the considerable costs and hassles of parking, or driving in congested big cities or old towns with narrow streets. To be clear, yes, having a car in many places can be the best way to get around (the Balkans come to mind) but IME the best way to do much of Europe is some combination of trains and rental cars (having the car only in those places where it makes sense).
It's a big trip and renting a car will be expensive for 2 months.
Just because you're going for two months, that does not mean you will need (or even want) a car for that whole time. If it were me, I'd take a look at my plans for where/when to be, and take a hard look at the best way to get around - don't look at the entire trip as one thing - consider separate chunks of the trip and what makes sense there. Munich? Prague? Vienna? You really want a car when you're in those cities? (I don't think you do.) See if it makes more sense to travel by train between some places (hopefully all strung together) and then switch to a rented car for other places (eg the Balkans where the train network isn't great).
Also be sure you take the downsides of having a car everywhere into consideration when you factor in all the costs (financial and otherwise) of your plan.