Recommend EDAZ Schoenhagen
Schoenhagen is a good GA airfield, about 50kms SW of Berlin IIRC, quite modern. Went there last year when it was VFR only - they were talking about getting an RNAV approach but don't know if they have yet.
Two good runways (one 1,510m asphalt, one 700m asphalt or 760m grass), well run but relaxed airfield. Reasonably cheap (parked my aircraft there for a week).
When I was there you were required to join mid downwind, south of the runway 07-25 / 12-30, then turn left onto downwind then right base if landing on 07 / 12 or turn right onto downwind then left base onto 25 / 30.
(They would not permit a straight-in approach, even though it was just before they closed for the night and there was no-one else around.)
A/G only