Hmmm lets see I think the nicest one that I ever flew into was a small airfield in Linz, Austria. It was surrounded by the mountains and the ground crews were extremely friendly. They helped us fix a problem we with our external fuel tanks, refueled us and then also had us over for a nice BBQ since the weather was too bad for us to fly through the Alps.
TPBM does not know what an FBO is.