Kagurazaka where to feel Japanese traditional atmosphere in Tokyo

If you think Kyoto is quite far from Tokyo to go to, Kagurazaka is the place you should go.

The main road of Kagurazaka was once at the outer edge of Edo Castle, opposite the Ushigome bridge over the castle moat, and has always been busy because of this privileged location.[1] In the early 20th century, the area was renowned for its numerous geisha houses, of which several remain today. Currently, Kagurazaka is experiencing a popularity boom due to its traditional, sophisticated atmosphere on the edge of modern Shinjuku ward.  https://en.wikipedia.org/wiki/Kagurazaka

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While it retains a traditional Japanese atmosphere, Kagurazaka now boasts a significant French presence with many French expatriates living in the area due to the proximity of l'Institut Franco-Japonais de Tokyo and the Lycée franco-japonais de Tokyo's primary section. Kagurazaka also boasts Tokyo's largest concentration of French eateries, bakeries and cheese shops. l'Institut Franco-Japonais holds a lively program of cultural events, food tastings, and film screenings.

https://en.wikipedia.org/wiki/Kagurazaka

This time I went to a Cider bar&restaurant called Le BRETAGNE Bar.

It is like a hiding place, also an old Japanese-style house and there you can have wonderful galette(Buckwheat crepes) and different kinds of apple cider.

Kagurazaka is also widely regarded as an important center of Japanese cuisine within the Kanto region. Several old and famous "ryōtei" are to be found in the winding back streets, often accessible only by foot. These ryotei provide expensive "kaiseki" cuisine, which is generally regarded as the pinnacle of Japanese food. Ryotei also allow diners to invite geisha to provide entertainment during the course of the evening. Many shops in the area cater to this culture, especially selling kimono, Japanese sweets, and tea. 

https://en.wikipedia.org/wiki/Kagurazaka