UNAGI
The restaurant called "Izuei" is one of the most popular Unagi restaurants in Japan. You should try Una-don for you to feel the local Japan. They make sure that you eat your eel in the most tasteful way.
Open: Daily 8:00 ‐ 22:00 +81-(0)3-3831-0954
5 minutes walk from Ueno station
Photo source: Izuei Website 5.13.2016