Very authentic Japanese food. Tried the ichisou menu which is a bit pricy but very complete. We were three girls and even though the menu is for 2 people we ate more than enough. If you have a big appetite I recommend getting a side of sushi also which is delicious.
If you reserve ask for the Japanese table And make an experience out of it. Also, go early at the kitchen closes at 11 pm- early for Buenos Aires.
Balvanera is not a great area but worth a visit if you're having dinner here!