A 20 year old bike is going to have some issues no matter what's been done to it during its previous lifetime(s). First thing you want to consider is having it checked out by an independent mechanic so you'll have a head start on knowing what those issues are likely to involve. Then prepare yourself for all the other stuff--mostly minor, in most cases--that will go wrong.
Second issue based on my personal experience--it's a short bike, and for me almost intolerably uncomfortable for that reason alone. Think about how this might affect you, or not.
Last, ALL bikes need some modifications before taking off on a long trip where you don't speak the language and where parts might be hard to find and consequences for failure more severe. It's nice when you find a bike which has had most of the necessary mods done (and paid for) by previous owners.
Hope that's helpful. I've got no informed opinions on your specific questions.
Mark
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