All that is true. A very friendly guy runs the bar here. Plus there is an excellent pilots' shop. French maps & guides for much less than Transair's extortionate prices. Mind you there is a good shop at Toussus too.
The best bit about Lognes was the paris VFR transit, which lets you fly from Pontoise east across the city, just North of the Seine, to the threshold of Le Bourget's runway. That was closed post Sept 11th. I have not checked whether it has reopened, but it is a great way of giving pax some aerial sightseeing of the city.