This guesthouse is so good I am going back for another night on a stopover in Tokyo. My room was great, located on a high floor and very bright with a balcony I have not used but opened all the time to add a nice breeze into the room.
Min's a friendly host and was helpful with check in and directions to his place.
The guesthouse is conveniently located 15 minutes from Shinjuku station and has all amenities including a wash machine.