Hi there,
there is a "Dark Cellar" in the first Act - easy to kill Zombies and most of the time a chest a pack of rare or a goblin.
Steps:
1. Stark Quest 1 - The Fallen Star at the Step "New Tristam"
take Waypoint "Old Ruins" and run south West.
2. 80% of the time the celler is open - so happy farming
THE LOCATION OF THE CELLAR
GOBLIN IN IT
PS.: If you run from the former step you get a checkpoint by entering "Old Ruins" and you are even more faster !
Edit.: Allright, it's more like 60% open, but it's like no time getting there