I never make appointments in advance and wait around for a customer (a bird customer that is). There are just far too many flakes out there. I also *never* give out the address to where we keep our birds.
If a person seems genuinely interested, I spell out in detail how we handle transactions. I find out where they are coming from and tell them the area we are located in (or mutually decide where to meet).
Once a general time frame for meeting is established, we ask them to call us as they are walking out the door to come to pick up the birds. At that phone call, we give them the address and directions. Having gone to this somewhat strict way of doing business has increased sells and reduced headaches substantially.