i think it would be a worthwhile investment as a seller to rectify a few bits and pieces. the rust by the strut is nasty!
I can't imagine it's a good feeling taking a car you believe to be a good example as part exchange then coming into the clique of people who know them and finding the car has a slightly dodgy past.
I would give the thing a 'Mike Brewering' to get a good price. At least give the thing a clean out to at least give us the impression you care about it.