For $6500 that doesn't look bad at all.
So what if carpet is faded. It's replaceable just like the faded drivers seat.
This is a 25 year old car. Not in a climate controlled garage, you will likely find some minor rust issues...
The doors, if they only have surface rust are fine. If they have holes, well, they can be replaced. I would also want to pull that quarter window and see what's going on with that rust bubble.
Finally, if you suspect the t-tops leaking, I'd ask about having the owner prove they don't (ie: you sit in the car and he runs a hose over all the windows.) I've seen t-tops leak and I've also seen a front windshield and rear window leak due to dried out and worn tar. This resulted in tons of pinholes all over the floor that could not be seen until the carpet was pulled.
If you're going to be looking a car, especially with t-tops, I'd see about pulling the carpet to see what the floors look like too. (can't be too safe)
Nevertheless, if the car runs and drives and looks as decent as it does in the pics and the vin numbers match where they are supposed to this does not seem like a bad deal...
Bear in mind that these cars will nickel and dime you to death so be prepared to spend money to make her 100%!
Good Luck with your purchase.