My boyfriend and I stayed here during our time in Tokyo. I really don’t have enough good things to say about the space. The location is central in Shinjuku, located on a quiet street, and very spacious by Tokyo standards. We never met Seiji but he was really quick to respond to messages. We stayed for 5 days so it was convenient to have a washer/dryer combo which I hear is quite rare in Japan. The apartment complex is very close to Shinjuku station and has an elevator which was convenient since we were bringing all our luggage on the train. The apartment is also very clean with small touches that I appreciated. Seiji sends you detailed instructions and put English labels on the appliances which were both very helpful. If I come back to Tokyo I would really like to stay here again. 5 stars!