Ok it sounds like the bike is a 23", as sdn40 suggested. The seller says the standover height is 32" and the seat tube length is 24.5". He also said the rear fender has a cut out of it, and it has typical wear and tear.

I'm sure it is too big for me. In case any one else is interested, the bike listing can be found on Facebook Marketplace, in Haven, Kansas. I'd love to see this rig back on the road!