looking through paypals documentation:
https://developer.paypal.com/docs/classic/api/merchant/GetTransactionDetails_API_Operation_NVP/
The wont send the billing address with the response. they only send the shipping address.
if you look at the linked page, there is the section for payer email, and payer name, the address fields section lists only shipping address fields.
So you will be able to get the payers email address, but not their physical address.
The only physical address returned by paypal is the shipping address.