I am really nnot comfortable in telling him the name. I have PMed him 4 out of 7 letters of the name in series. Should be enough to decide if its good enough.
u should not need to share the username or gives any clues at all. in fact it is unfair for other bidders or potential new owners because now others may know the identity of the account.
if escrow is used for the sale, there is no need to reveal the username unless there is a very important mutually agreed reason to do so
I agree with your statements. I accept escrow and he would check all the details provided in the OP.
I wont be providing usernames unless you have a really solid reason.