For the Friday nights of 13th and 20th December, the Gneisenaustraße meeting will be at:
MEHRINGHOF
Gneisenaustraße 2A
10961 BERLIN
2nd Courtyard / Aufgang (Staircase) 3 / First Floor Left
See here for the location on Google Maps: https://goo.gl/maps/iwgxmZKhe4S2eXudA
For the Friday night of 27th December, the the Gneisenaustraße meeting will be at:
Nostizstrasse 6
10961 BERLIN
See here for the location on Google Maps: https://goo.gl/maps/eC8CRYhLaGrMBquz9