Ok I can't find the other thread, but took the time to look at the how to use direct checkout.
It seems like the answer is it pulls from Etsy unless the customer enters something different. Link here:
http://www.etsy.com/help/article/1939So, in any case, the buyer is always in control of the address and the address should show up the same way on both the receipt for the seller and the buyer.
I just wanted to put that here because I couldn't find the thread referenced by Evelyn. If I'm not correct with the info please correct it.
(Can you tell I have a thing about dead end threads)?