I have mixed feelings about Bar Koyoi (now called Sake Bunker, which is strange because they are not in the basement and don't have a downstairs section either).
The good: dark and chic atmosphere. Friendly and caring waitresses and bartender/manager with one waitress ended up sitting to break bread and drink with her (by then former) customers! Motsunabe and oden are traditional Japanese fare and on the menu. They are well done too. Second floor has a dart game so they have tried something a little different.
The bad: too many fake or Western food items like pizza, French Fries and whathaveyou with a Japanese twist to give it that oh-it-is-Japanese feeling. They also have the Toronto-standard Korean items because naturally we found out the owner is Korean (but has a Japanese girlfriend). Also, do not sit in front of the door, which means half the first floor is uncomfortable to sit in, but again the waitresses and bartender are very attentive, caring and polite and try to accommodate or get the door closed as soon as possible (before you get pneumonia).
Oh, and do not expect a boisterous or exciting atmosphere like Guu or any Yakitori skewers there because they completely skip over the yakitoria portion of things.
This address is the second location of Koyoi if indeed they could be considered sisters since the marquee as mentioned is now Sake Bunker.