don't speak German? -> you'll receive bad service almost everywhere -> you won't get in to a lot of good clubs etc.
don't look like German? -> you'll get stares -> you'll be second rate / tourist / something
like drugs? like to party from 01AM to the afternoon of the next day? -> you'll love it
like sightseeing / going to the "best" places? -> everything's spread around a pretty big area -> you'll take the train / taxi / bus pretty often
like pretty buildings? -> in general, Berlin is ugly and crude. Except for the rich people areas and some places in downtown.
Partying two days without sleeping in the same club with a wide variety of substances is normal. There are weird sex club party thingies. There are ug techno parties with all kinds of debauchery. There are parks with more drug dealers than other people. Definitely not conservative, but somewhat xenophobic.