This is a small company and made up of folks who live locally in Vietnam. If you are looking for a safe, memorable, and absolutely perfect way to see the city, do this trip through this company.
My wife and I took a private motorbike tour with this group, specifically Brian and Cung, and they were the best people we met while in Hanoi. They gave us an experience that we never would have dreamed of, from mixing history with food to sweeping views off Long Bien Bridge, to the flag lowering ceremony at Ba Dinh Square. We learned so much history, got to know our guides over various eats (banh mi, yogurt coffee, aforementioned dinner), and discovered new foods and tastes that only they could help us find. It was our most memorable and personal experience in Hanoi, like we were out with new (and old) friends.
The ride itself was very easy, comfortable, and relaxing--both our guides were excellent drivers, of course. If you are nervous or hesitant to get on a motorbike in this city, don't worry! This tour group has you covered!