Beautiful place.We took the road from lake Rosu. It is possible with a 6.4m Fiat ducato maxi. But we were happy about our motor protection from underground :) The road is OK until 3km before you arrive. then leave the main road to the left. we did not take the small one google suggests but the next slightly bigger one. It is steep with nasty ruts but doable. Not when it is wet and in the dark!