I'm not sure what the Skoda interval is, but I'd say what I always say: check that the timing belt has been done ... if that big elastic band snaps it's game over. You'd be wanting concrete evidence.
I'd pay in the late €3000's for that car, in fact maybe more like 3.5k., considering if something(s) go wrong you're left with potentially expensive repairs. I'd be inclined to haggle on that point. Personally speaking, I'd be more inclined to go to the Auctions if you're willing to take that kind of chance ... you'll probably bag a car cheaper too.
Whilst hopefully not waffling, I would treat 'Sold as seen' and 'Trade sale' adverts with a touch of caution. You could end up with a bargain or a lemon. I learned this lesson the hard way. Both effectively mean you're buying a car that hasn't been checked / isn't guaranteed.
For example, If Mrs. Jones trades in her 2003 Focus for a new car and 30 minutes later Joe Bloggs walks in and is interested in her Focus, that's the scenario. The seller has not had a chance to vet the car so the buyer is taking it on that basis. That should be acknowledged in the price being lower than normal.