Koichi fetched us from Shinjuku station. We were late because Narita Express had a delay but Koichi waited for us. He even helped us carry our luggages up to his apartment. He gave us great tips and responded to all communication promptly.
Koichi apartment is near Family Mart, 7 Eleven and Maruetsu (all of them are 24 hours). Train station is only 5 minutes walk away. There's a great Indian restaurant (Sansar) near his apartment which serves great food.
On the day, we checked out from his apartment, he kept our luggage with him and brought it to Shinjuku Station on the time we agreed.
Once again, thanks a lot Koichi. All the best.