Depends on if you mean at night or always. There aren't too many places that are really bad during the day. At night, I wouldn't go into East Liberty, the Hill District, Parts of Downtown. That being said, if you get the opportunity to choose where you live, I would tend to lean more towards Squirrel Hill. It can get congested, but you can walk just about anywhere. It is a Jewish community, but it is very diverse in the types of people that go there.
Oakland is where Pitt is and unless you don't mind being overrun with students. I wouldn't live there again, but there are some places to try for food and parks
Shadyside is near Squirrel Hill and is pretty nice, but pricey. It leans more toward the yuppie side.
South Side is the place where there are 100 bars on one street. Nice if you like variety, but can get really busy when school is in session. I liked going to the Irish pub there or my favorite coffee shop - the Beehive
Just a quick rundown for ya! I will be able to give you more when you know where it is. Sometimes people say Pittsburgh, but it really isn't there.
PS - congrats
