r/W201enthusiasts

Hello there,
I have an opportunity to purchase a 1989 E190E 2.6 with 96,000 miles.
It was own by one owner, a wealthy guy (allegedly) who did all the required maintenance at a certified Mercedes dealer/shop.
Now, the body and the interior is not in ideal condition, it has some scratches from a grocery cart, the leather is peeling off from the door cards. AC is not blowing cold - an old R12 system

The seller is asking $7,000 (has been trying to sell it for a year)

I have several questions for you:

1. What should check when I see it (planning to check it in about 2 weeks, the car has been sitting outside for a year in a somewhat remote area)
2. - maintenance list?
3. - records for timing chain?
4. - places for rust?
5. - anything else?
6. How much should I pay? (Usually, my rule is, if I buy a car, I want to pay the amount I'll be able to sell it next month if I need to). And I think (maybe I am wrong) $7,000 is too much
7. What's the maintenance that I should do first after buying?

Thank you, attached some pictures of this car