First of all, Noboru is probably one of the nicest guy you'll ever meet. Expect fantastic hospitality for the duration of your stay. When you book with him, he'll send you a video as to how to get to his home. While its in Shinjuku, its location is quite funky, requiring you to take the lesser known/taken Toei Oedo line from Shinjuku-Nishiguchi or Iidabashi.
After 50m or so, and up a flight of stairs, you're welcomed by a very cosy house with a plaque on the door saying your name(s) and which room you're assigned too. There are 3 rooms, but the rooms are spacious enough to hold 2 people if you dont mind 1 person sleeping on the floor. Each room is equipped with AC and fans for the summer, and a TV!
Throughout the house are various signs written in Japanese and English, so understanding the house and its functions should be pretty easy? There are 2 washrooms, 1 on each floor, and 1 shower/bathroom. One thing to caution if you're a light sleeper is the fact that Japanese houses are made of paper, literally; so most noises from outside and inside are audible. Most if not all noise will transfer through the walls, so please watch your volume and/or activity. ;)
One of the best and most unexpected thing about Noboru is that he'll leave you a prepared breakfast at your door everyday. It was a total surprise, which made the my stay all that much enjoyable. If you are looking for a nice place to stay for a very reasonable price, i highly suggest Noboru, he'll take care of you with outstanding Japanese hospitality.