Who built her and when? Is it a name you can google and get a clue about reputation? Is it big enough to truly live aboard or will it get old quick?

If all the present owner is doing is cosmetic, he probably thought the hull was solid or why bother with cosmetics. Then again, why is he walking away?

Having a survey done is a good idea. Those guys will find problems and potential problems. She may have some "issues" that can be easily remedied, the survey will let you know.

Free only means you have no up-front expenses. Operation, maintenance, et al are not necessarily cheap.