Hi relique,
if this question is moved to the germany forum i bet you will get plenty response.
for party time u have plenty of choices, depending on what u like.
good start for an evening is around hackescher markt-lots of bars and clubs and restaurants.
in friedrichshain, in the simon dach street and surrounding areas-great place-bar next to bar and restaurant-young party crowd, relaxed.
for restaurants, you have high scale like vau, fischers fritz, margaux-all with decent offers for lunch.and of course a huge selection of all typrs of fine places-tellme what food you like and i give you a recomend.
cheers