Sibiu, the easy to love city. So laid back and for its well maintained and walkable historic center.
My title is slightly misleading.. the Dacian site of Sarmizegetusa Regia is not technically on the direct road from Hunedoara to Sibiu. It is a detour in the mountains but so worth it.
Although one day is enough to stay in the old town of Sighișoara, the advantage of staying 2 nights is being able to explore a few local sites at a slower pace.