As a general rule, Audis seem to hold up very well. Sure there are problem with the leveling system, eventually on all of them that have it, but it's usually something like a line leaking where it goes into the strut...simple things like that usually, but if left un attended to they could turn into costly repairs.
As far as known problems on your car, the best thing I know to do in this situation is give you the list of recalls and TSB's on the car.
Just need to know if your engine is the 2.7 or 4.2? If you not sure about the engine size...Does it have turbo?
you will get a warning light, if there is a problem in the system.
Anyways, here is the list I said I would give you. If you decide to get the car, keep it handy for future problems that might come up, then you can reference a number to the technician, that might help make things easier.
Also, if you know how many miles are on it, I can give you the next scheduled maintenance required for the car.
It's ALL good, I'm here to help.
Anyways, here you go!
Pretty good to go, at 60,000 it needs a good look over, a cabin air filter, and an oil change.