Price in order for a 2009 Phaeton?

Hello, I have a VW Phaeton in mind at the moment. It should be a 2nd car. However, I have no plan of the car and have a bit of fear or respect, if one reads here can sometimes become a fear and anxiety. Actually I wanted to get an A8 year 2011 for just under 36,000€. However, I have now discovered this Phaeton year 2009, it should cost 19.990 €. It is about the petroler V6 3.6 Has just 75,000km on the clock. Equipment he even has something:-) the 18 way seats, leather,purstaining,stand-off-assi,stand heating,Dach,Dyn Audio etc. The problem is that he is not standing at a VW dealer but at a free so-called multi-brand dealer. Also a large car dealer is not a flag dealer. Can one access such a car without consideration or is the repair technical too dangerous?