I can't enough wonderful things about the Koji and his apartment. As a host, Koji and his family went above and beyond to make us feel welcome and comfortable. He met us at the apartment and brought a bottle of local apple juice and bananas to welcome us. He was accessible throughout our visit.
As for the apartment, it is absolutely beautiful, spacious and newly renovated. The pictures really do not do it justice. My mom, aunt and I only stayed here 2 nights, but wish we could have stayed for our whole trip to Tokyo.
When we left, Koji arranged for his brother to give us a ride to the metro station, so we could catch the train to the airport. It was a great help since it would have been a 15 minute walk with heavy bags. He also looked up the train schedules to ensure we caught the right one.
Overall, I highly recommend this place and would stay again in a heartbeat- the neighborhood gives you a great feel for local Japanese life.