We stayed at Campingplatz Gatow in 2013 and it still gets a good write up in the 2024 Caravan Club handbook. Very easy to find and bus stop at the gates for Berlin or bus to S-Bahn for train to Berlin. Next to a wood which is useful for walking the dog. Very nice site and flat. The only trouble was there is little shade and it was in the mid 30's when we stayed there.