Audi TT, is it worth it?

Hi, everybody! I’m a disappointed Opel driver. Now I want to pull something else in. I saw an Audi TT Quattro, 1.8T (225) today. Has 93’000 km, no accident, leather equipment, car body i.o. The car actually looks like new from the outside and inside. Price: 21’000 SFr (that’s about 13’462 Euro). 1. What do you think? Should I hit it? Or is the mileage already too high? Price/performance? 2. What about the rear seats? grow out for half an hour? (mostly I have only 1 passenger, but it also comes before there are several) Please help me! Can’t decide! 🙁 Thanks in advance for any helpful answer!