Four of us had an excellent two-night stay at Kei's place in Shinjuku! The house is only about a 3 minute walk to the major streets in Shinjuku, but is on a quiet side-street with no noise. We were able to walk to the metro easily, along with attractions in Shinjuku itself. The house was great, especially the raised beds (great for older guests) and pocket Wi-Fi (great for international travelers).
Kei and his wife were responsive to all our questions and provide a great guide to the area and to the house.
Thanks, Kei!