and you definitely checked the downstairs right of the bar on upper platform, did you?
if you are sure, use console
PlaceAtPC "yourNPCnameHere" 1 1 1
(if you wouldn't like to be on the same spot with him, see the CS Help).
You will do no harm because it does not make the copy of NPC (just changes location) and keeps intact all his characterstics including disposition to you (it's why one need to take care recalling a NPC he just have killed some time before, no welcome expected

).
On this occasion you even do not have to care if he is in exactly right place, altogether you may be going to want to see him once more, so remeber where you've left him.