If you can buy it for fifteen hundred and the car is generally presentable and not ragged out and if you have $1500.00 in spare change, not money you really need to put into reliable transportation, then why not?
If you have an itch to own an Audi, this might be a good way to scratch it.
This car might turn into a nightmare, but it'll be a fairly inexpensive one.
If you have an itch to own an old German status brand, any old four cylinder BMW or Mercedes would be a better car in every way.
No Audi was ever built with the component quality of an e36 or a W201 just as no older Benz or BMW was built down to the VW parts standards used in Audis, although many later DB and BMW cars had serious problems related to various supplier parts, especially electrical ones.
I'd probably pass on this bargain Audi, although when I was younger, I would have been all over it.
FWIW, our lone VAG product was an air-cooled Vanagon.
It was a durable and reliable vehicle in every way except for the cracked heads at around 105K, a known problem with the Type IV engine.
This was coincidental with a seized pilot bearing at about the same time, so the engine had to come out either way. There is no easier engine removal task than the flat four from the back of a Vanagon.
I actually removed the engine to replace the pilot bearing and then decided to do a quick rebuild while it was out, jug kits being so inexpensive, ya know. I discovered the cylinder head cracks upon tear-down and later learned that these were typical for the engine.