I visited Ochanomizu earlier this week. There are some interesting places near Ochanomizu station. I think this Kanda-river is also nice.

St.Nikolai Cathedral is an orthodox church. Pictures from St.Nikolai Cathedral...

Yushima Tenjin is a Shinto shrine. Yushima Tenjin homepage.
Pictures from Yushima Tenjin...

Kanda Myoujin is also a Shinto shrine. It is located near Yushima Tenjin. Homepage.
Pictures from Kanda Myoujin...