I lived in Chicago 'til I was nine, before moving to Atlanta. I spent the bulk of my life there before migrating to Knoxville, and thence up to Indy. Therefore, I have limited experience with accents.
Obviously, there is a distinct Chicagoan accent, and then there are the various shades of Southern accent, with which I am familiar, but in Indianapolis, you are exposed to that particular tone of speech, spoken in a swath running from Cleveland through the Circle City and on to Saint Louis, that, thanks to over a half century of national network newscasters, is as close to Received Pronunciation as you can get in American English; a sort of accentless accent.
I can't tell regional New England accents apart worth a damn; my untrained ear can't spot the difference between a Downeast Mainer telling me "You can't get theah from heah, ahyuh," and a denizen of Southie saying "Gimme your $%^&#@ wallet or I'll $%&^* stab you in the #$%@& kidneys," so this week at Castle Frostbite has been a real treat for the ear. You see, Marko and Robin have contractors doing some work on the place and every time I step outside for a smoke break it sounds, to my southern ears, exactly like I'm on the set of This Old House. It's awesome.