I've always had some mint planted, the last 30 years, between two houses. Never has been a problem for me. It does want to creep a bit, but nothing so bad that you can't just pull out the unwanted new strands to keep it in its place. I only have to pull it back once or twice per year... hardly a big problem.
I've told this story before, but it's too good not to tell it again: I had mint planted next to basil at my old house, and one Kentucky Derby weekend, I sent my sister out to pull some mint to make our Juleps. My head was all stuffy with allergies, so I somehow didn't notice that she came back in carrying basil leaves, and proceeded to blindly make a few cocktails with the stuff. Let me tell you, a basil Julep is not a drink you ever want to try.