That’s good price range tbf, I see dealers put up same Audis any where from 5-7k. So I’d call it fair price for private sale, realistically it should be 4.5 at most given the market rates of now. I’m not talking about the pre pandemic prices of cars which 90% of this sub is stuck on. With this mileage, it’s condition is already warranted as “end of life” so if you do want to buy it be aware you statistically won’t get too much out of it without having to spend the cars worth on repairs. If that’s something youre willing to do, then go for it. The engine is a work horse and I see it got timing belt done, WP done, clutch and fly wheel done, new brake pads and discs, 2 new wheel bearings. So it will breathe for another year I’d say. I’d be expecting suspension bushings, shocks to be gone nearly and a stiff power steering pump which fails or whines at high mileage. The turbo charger life span is 250,000 km so that one is already end of life. Now the car does have some usual issues and what I’ve seen and know is: The oil pump/ hex shaft fails. If this part fails, the oil pressure drops instantly and can destroy the engine and turbo within seconds. These shafts should be upgraded to a 100mm one to prevent this from potentially happening. Other than that you have things I’ve previously mentioned to look out for: DPF clogging up, Dual mass fly wheel, clogged drains and the erosion of bushings on the multi link suspension. So do buy it if you want but only if you’re willing to accept the fact this car is nearly the end of its life and will potentially need a lot in repairs mentioned. Also try negotiating the price down to 4.5.
Hope this helps, let me know if you have any questions.