I got order from japan once, just contact with the buyer copy-paste the adress on paypal and ask her-him that you are going to print out this adress , is that correct?? Sometimes etsy adress and paypal adress might be different...in any case of no answer use the paypal adress.
in my experience, the shipping took just 5-6 days from Turkey to japan. Actually I think japan post is working great. Just don't try to write it by hand :)
Good luck