I've been in there and tbf getting in is a bit of an art form. For a start do not show up with a big group lads - that ain't happening. Also it's a fairly funky out there club . Nice shirt and smart shoes isn't going to work . They are after a certain type crowd and god knows what the criteria is but my mate and I seemed to match it . T'was good craic but by know means the most amazing club you'll ever be in your life.
Get yourself down to Kreuzberg and Friedrichshain , pretty cool districts with plenty of decent shops , boozers and gaffs to grab a munch . Lots to see in Berlin , actually too much to see in one trip. You can do the obvious stuff like go to check point Charlie and all that , and you can rent a Trabant and do a tour of the city which is a bit of fun. You can also hop on a boat and do a little tour down the river which is a bit fun. Enjoy , great city.