Are you thinking of Merville?
I have never been there but meant to on a number of occasions.
Every time I fly over, there seems to be plenty of GA activity in the area and I see there are some town houses for rent and to buy very close by.
I always park on the GA apron at Lille. Strangley, come to think, I have never noticed much else in the way of GA - maybe it is parked elsewhere.
Lille is a pain getting into and out of until you realise there is a seperate gate for the GA apron, although that doesnt avoid the security or usual x-ray checks.