The location impact, but the adventure is more important IMHO. And fighting an mindflayer spelljammer ship who fought a draconic army doesn't seem a adequated adventure for a lv 1 char.
Then the question is what defines an adventure level for you? Is it story and location or enemies?
If you were told that a bunch of imps escaped from their cells in a magic scool and terorise the town. Would it be acceptable? Cause in prologue you have to kill 3 imps and press one leaver guarded by onother 6, that come in groups of 3. Everythisng else is optional and surve to paint a picture of enviroment.
