advice on showing a gun.

[Robb]

I have a couple guns for sale here on the forum, and I put them on Armslist also. I just got an Armslist bite and someone wants to take a look at one of them. He wants to look at it tonight.
Absolutely reasonable, and I wouldn't have too much concern if this was a forum member but since it isn't, how would you handle this? I don't gun wheel n' deal.
Any public parking lot?
Or make sure it's at a FFL and no need to look before money is in hand?

Thanks.