Les Eplatures (LSGC) in the Jura mountains is nice & friendly - like a UK GA airfield, but with ILS. PPR/Customs requirement is satisfied by a flight plan to them, in my case 2 Customs agents drove in to meet the aircraft, took my passport number, then came back again in the afternoon to have their photo taken next to the aircraft! Fuel/handling's simple, both Jet-A1 and Avgas available. And it's only a short walk into the local town, decent airfield cafe too.