Koichi is the loveliest Airbnb host! He provided us with bottled water and then even drove us to the station with our luggage on the day we left.
The place is small but manageable for the 4 of us for the 2 nights. Everything was clean.
The place is about a 10 min walk from Shinjuku Station and in a quiet residential area that felt quite safe late at night. Shinjuku itself is a maze of people and there is a lot open late at night.