I would recommend Ostend. I've used it several times on ferry flights. Shortest time landing to take off 50 mins, longest 2 hours (trouble getting the engine started).
Every time I've been there they've let me taxy straight up to the fuel pumps. The trick is to park at the pumps and, if there a 2 of you, one goes off to the terminal (about 200 metres) and files the flightplan while the other gets the refuel done.
From Ostend to Paderborn it is possible to avoid all of the built up areas and control zones without too much of a detour (if you don't want to talk to atc), but personally I've always had good service off German air traffic.
Hint for VFR flightplans around Europe: In Route section put in as little as possible ie, just put in the FIR boundary points (a lat/long will do if there isn't a waypoint) then DCT. The less you put in, the less chance of a rejection on a technicality.
Happy flying.