[Sangetsu]

The apartment in Kagurazaka is the most conveniently located, being within the Yamanote circle. It's closer than Kichijoji to anything that you really want to see.

20 minute's walk might not sound like much fun, but believe me, there are few places more interesting to walk than Tokyo, you'll find interesting sights even in the alleys.

Print out some maps on google, there are street level views for all of Tokyo now, you'll be able to recognize the important intersections.