Stop in for a cup of coffee

My son wrecked his 350Z and it looks like they may total it so we're looking to buy a used car for him as he's a college student on a stipend. We've found a Nissan Altima AWD (which is a better choice than his RWD Z) because of all the snow they get in Spokane. Anyhoo, car only has 1,400 miles on it, clear/clean 1 owner Carfax etc. He's test driving it today. I haven't bought used off a lot ever I don't think, any pointers/reminders out there?