Koichi's place is a clean and beautiful apartment and makes for a great place to stay. I would not recommend booking for more than 2 people as there is only a small amount of floor space in the bedroom and that was easily taken up by our 2 suitcases. There is also no dining table, so prepare to relax/eat on the bed. If you are travelling with your significant other, than this will be a cozy and lovely place to stay. It is about a 25 minute walk from the main Shinjuku station (accessible with JR) or a 4 minute walk from the local train station. The neighborhood is very quiet and check in was a breeze!