buyer/seller integrity question

I consider myself to be straight up & I dont want to get over on anyone. I told him about the drivers door latch needing adjustment for the door to shut clean & the hood latch needs to be held "open" as you shut the hood. I did not tell him about the faulty driver door armrest. that's all I could think of of. first time when we talked he expressed his unhappiness with it with a long list of its faults & wanted to reverse the deal & for me to relist it & send em to his address to pick it up, then he said he wanted to keep it but get a partial refund. I asked him how much & he said 5500. he said the body was junk & the only value was the drivetrain. the car is in the "mopar cars for sale" section & I think I asked 13K not 11K as I posted earlier when I went back & checked the ad. if you would like to view it. thanks guys for the comprehensive help on the stressor.