I used Craigslist for my last two sales. The key is to NOT give a phone number - email only.
You can weed the scammers out VERY quickly that way.
For the truly interested, you can set one day as the sale day: "I am meeting with potential buyers starting at 10 am on Sunday. Cash only. What time would you like to be here?"
In both instances, a family came to see the car: one family looking for their older parent, and in the second instance, a daughter heading off to college.
I sold to the first person both times. Minimal hassle.
Keys to a quick sale: clean and detail it first. Gather all your maintenance documents. Take 8-10 pics, all four sides, interior and exterior. Advertise it as NON smoker car, clean title, maintenance records available, and if you're the first or second owner, note that as well.