The house was nice. The host's parents greeted us when we arrived, and were very nice. The husband's English was pretty good.
There are a bunch of vending machines nearby, which is important to me personally and probably no one else.
Along the main street from Eifukucho ("a fook cho") Station, there's a drug store, restaurants, a 7 Eleven (I visited frequently), etc.
The nearby Kanda River was pleasant to stroll along.
Travelling into Tokyo takes some time. Getting to the Tokyo Station area ran me about an hour. To get from Eifukucho Station (on the Inokashira Line) to most of Tokyo usually involved transfers through Shibuya, but the signs to get to/from the Inokashira Line were....inconsistent. Sometimes they were in English, sometimes in kanji, sometimes nonexistant...
Also, Google maps always wanted me to walk to Meidaimae Station. Don't trust it. That walk is an uneven, slippery labyrinth. Just walk to Eifukucho.