I bought a Brother CE 4000 off Craigslist and when I went to the woman's home to look at it I mentioned that I was a little leary about coming alone and was surprized that she wasn't too. I suggested, since she was a young woman living alone that she not have anyone come to her house. A few weeks later I saw a listing for a walking foot for a Brother machine --- meet in a public place. When I contacted the person selling it she emailed me back and said, "You know where I live and I know you're okay, just stop by the house." Same woman, I saw humor in it.
I've never sold anything on Craigslist but I'd make sure that perhaps a neighbor or friend could be there with me when I showed it or only show it when your husband is home.