This is one of Santiago's top restaurants for sushi, and the most typically Japanese, including a tatami seating area where you store your shoes in a little cupboard. The food is fresh, and there are more varieties of hard-to-find fish here, though typically in Chile most of the sushi fish is salmon, tuna or another whitefish.
It's also Santiago's oldest Japanese restaurant, and dates back to a atime when not everyone and their brother were selling sushi out of a storefront. The food is good, and includes udon soups and other warming and tasty dishes alongside the sushi.
Japón is frequented by Japanese visitors, who sometimes stay in the Japanese hotel across the way. The restaurant is conveniently located just a few blocks from the Baquedano metro which serves the green and red lines.