Time Out says
One of Ginza's finest old-school eel restaurants, Chikuyotei is best known for its classic unadon (eel over rice), but also serves other fine seafood in ochazuke (over rice, with tea poured on top) form – just the way it used to be back in the early 20th century. Places like this are becoming increasingly hard to find in Tokyo, but this one doesn't look like it's going anywhere: there are even queues outside of the shop on some days.
5-8-3 Ginza, Chuo-ku
|Transport:||Ginza Station (Ginza, Marunouchi, Hibiya lines), exit A5; Yurakucho Station|
|Opening hours:||Mon-Fri 11.30am-2.30pm, 4.30pm-8pm; Sat, Sun & hols 11.30am-8pm / closed Mon|