Although it's been very popular recently, Japanese style grill's never been my favorite until I found " Kanpai Classic" in the A9 (One of the department store buildings in Xing-I area, Taipei). Most of these types of restaurants are usually dark inside, sometimes even smoky and greasy. This one is completely different, it's bright and joyful, the staff are well trained, friendly and willing to chat with you. (Most of the same type of places do have this kind of atmosphere, though.)
There are tables, private rooms as well, but the most comfortable and interesting area is the bar. They prepare everything for you and the air circulates better there. (In the table or private room area you still have to grill your food yourselves when they are too busy. Unless you are one of the clients who prefer to do it yourself.)
The beef quality is pretty good here, I recommend the thin sliced type, it's better and cheaper than the steak. (Although they pull a cart and have a Japanese chef slice it beside your table, it's more a show than the real quality.)
To pair with your meal, they have really good draft beer, both dark and light, Sake's not bad either but more pricey. Serve wines as well.