This place serves authentic Japanese food. I've been there 4-5 times.
Ematei is kind of in between Izakaya and Ryotei style. Many small dishes like Eringi mushroom saute, grilled chicken, butter fried shiitake mushroom, tempura are good. Sukiyaki hotpot was also really delicious. Sushi, however, was good at a first visit, but wasn't afterwards. If I want to eat sushi, I'd definitely go to other restaurants that specialize in sushi. I'd say this place is good for sharing tapas or hotpots with others.