Welcome to the forum Kevin, you'll find the members on here are a friendly and helpful bunch :)
Sounds a very nice spec of A7 you're going to look at :)
Is the car for sale at a garage or private seller?
Obviously have a look at the service history and ideally this should be full. Also make sure that the gear changes are smooth both in auto and manual mode as any faults can be expensive to fix. Also make sure that all electronic items work as these too can be expensive to put right.
One key area to look at are tyres. Are they the same make and I'd the tread wear the same? I ask this as the Quattro system can be sensitive and can be damaged by uneven tyre wear. Joined with this be careful if the car as Dunlop maxx tyres. There have been cases on here of the splitting. Here's the thread for more info:
It's also worth getting an independent inspection carried out by companies such as the AA or RAC. If the seller is reluctant or refuses to have the inspection carried out then you have to wonder what they or the car has to hide.
Here are also a couple of YouTube videos which may also help:
This one has English subtitles
a7 review
Hope I've helped :)
Cheers
Steve