You will need vignette's in Austria and Hungary. You should be able to buy them close to or around border area. The Hungarian one is now an "electronic" one. So you dont have a sticker to put on your bike, just keep your reciept as proof of purchase.
As far as insurance goes, check yours, but those countries that you list should be covered by your own insurance already.
As for road conditions, Romania will be the only one that I would take extra care with. Roads can be poor sometimes. We also noticed that most small towns and villages that had a main road through it, also had police hanging around, so watch your speed. Never saw anyone pulled, and most drivers comming the opposite way will flash to warn you.
Just enjoy its a beautiful country.
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