Vienna is perhaps my most frequently visited European city, but ironically, until this recent trip, I've always been too busy to see the real Wien. Thanks to Airbnb, I was "forced" to see what's beyond Innere Stadt, and, believe me, there are plenty of cool things to do there if you're not fond of museums and opera houses. Vienna is a hip city - with Monocle and CitiX60 having travel guides for it, then it must be hip indeed. Airport to Downtown Train: Yes. Free Wifi: Almost…