My Romamian experience is also dated back from the early 80's to the mid 90's so I can not comment on today's conditions.
Back then conditions were "the wild east". I hope it has changed much to the better but I would still park the car in secure and locked places only. Most people were always very friendly and helpful but there is a certain number of orhers who have problems to make a difference between yours and theirs.
Fagaras area is worth a visit but back in the 90's I preferred 4x4 cars instead of a 4/4.
