Purchase advice 406 Coupe 3.0V6

Hello guys, I have to buy this car.http://suche.mobile.de/…/showDetails.html?… Unfortunately I have no idea about Peugeot.How good are these cars? Is the 3.0 even suitable for gas operation? How good is the automatic transmission? How many gears? Tiptronic? What about the maintenance of the gearbox and the engine? Do the cars have rust problems? What should I pay attention to in general? I would be very grateful for every tip. Greeting Artik