We've eaten at Kohan a couple of times, now. The first visit we sat at a table (we had a party of 5) and really enjoyed the food, but found the service frustrating. A standout was a fancy combo maki (whose name I sadly can't remember) with perfectly cooked (yes cooked!) salmon wrapped around the outside. I also really liked the spider maki -- the chef includes some lettuce and sprouts in the roll, which is a nice moist/crisy/fresh complement to the softshell crab and the sauce.
Our second visit was last Monday, and we sat at the sushi bar with our 3-year old. A good time was had by all. If one is eating sushi, there is just no better option than sitting at the bar and getting to know the chef. The sushi chef, "Chris", was friendly and accomplished. We ate early and pretty much had the place to ourselves (a plus when dining with the 3-year old). The chef comped us an amuse bouche of scallops, served in the shell, with some sort of tasty sauce. Very yummy.
We live on the South Side, so Kohan is a great option for us. The food is very good (not transcendent, but very good), not ridiculously expensive, and the location, with parking, is pretty convenient. The atmosphere is nice but not overpowering, and I feel comfortable bring my Ikura-loving son here.
I realize Maxwell Street was lobotomized, but I knew it mostly from the Blues Brothers. The new arrangement is not unattractive, and it seems like many of the beautiful building facades have been preserved and restored. As a long time South Sider, I am delighted to see more good cuisine options move of Congress. It would be great, though, to have some dining and retail options that capture the spirit of old Maxwell Street in a new and creative way.