Search is your friend..tons of threads regarding reliability of the 3.0T drivetrain and C7 platform out there.
To clarify, the US 3.0T cars don't have the DSG, they have the ZF 8-speed. The non-US 3.0T cars do get the DSG as well as the US 4.0T cars.
These cars tend to eat brakes...I'm at 21k on my '15 and I think the front rotors/pads are on the way out...so it's good that they were replaced during the 45k service. Good also that it has new tires, but you'll want to know what brand they installed as a good set of tires really improves the handling of these cars and a bad set really lets it down.
Be mindful of options too. If you like sporty driving, then a car with the Sport Package would be good. It includes stiffer springs/dampers that lower the car as well and it also includes paddle shifters (I think that was the case in '13, someone can correct me if that's incorrect). These are big, heavy cars so even with the Sport Package, they still have a fair bit of body roll through the corners (too much for me at least). Other options are your personal tast of course.
Overall, these are great cars. I'm on my 3rd A6. The 3.0T is a great motor that can be improved with a tune, intake, exhaust, etc. There's lots of suspension improvement options and wheel options as well. For the interior, there's things you can do like steering wheel and shifter upgrades, etc. So you can really customize the car to your personal taste if you're into that.
Good luck on the search!
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