Takashi san is a great host. His guidelines are informative and helpful.
He let me checked in early when we dropped off our luggages and that helped since i was unable to sleep during my overnight flight.
He also helped to find a place nearby to fix my broken glasses.
The location is good. Few minutes walk from Koenji station and there are many restaurants, stores nearby.
The only issue is the pocket wifi wasn't working for us. That's minor since we all have a decent mobile data plan and we were out all day.