Okay I live on the northside of Minneapolis. It isn't that bad. Yes we have some gang members and murders. But nothing major happens. People act like the northside is gonna eat you up and spit you out. Before you judge a place, try going there and giving it a try.
Just be sensible. I am 22 and I have lived here my whole life. Minneapolis and St Paul are like any other cities. There are spotty areas around downtown to avoid, but pretty much nowhere is a good idea to be in the middle of the night unless you are in the suburbs. Still even then nighttime can be dangerous. Specific areas to avoid might be the Payne-Phalen area east of downtown St Paul and Philips on the South Side of Minneapolis. Also, I have never had a bad experience riding on the light rail and I have done it quite a bit, so use the trains and buses as they are very helpful. For the most part the Twin Cities is a great place to walk around or hang out in.
For your own safety you will want to stay out of the poor black neighborhoods. These are extremely high crime areas. A lot of the people living there have moved from Chicago and Gary, Indiana to take advantage of the liberal welfare system in Minnesota. These people are the worst of the worst and should be avoided at all costs. Don't end up learning the hard way. This is probably the best advice you are going to get. Definitely stay out of North Minneapolis and the Philips neighborhood in south Minneapolis. Minneapolis ranks high in crime and rates 30th out of 450 metropolitan cities in the U.S.