The Ninja House is a pretty cool and unique place! It is a tall, skinny standalone building, and once you get used to this structure, it is quite fun to climb up and down like a ninja indeed!
Location: only several minutes walk from closest subway station, Hatagaya, in the great Shibuya district. Quiet neighborhood. Also, the closeby Rokugo-Dori shopping center on Social Education Center street is super clutch for late meals and convenience center runs.
Amenities: Wi-Fi, in-house washer for clothes with hangers and rack to air dry, kitchen sink and plates, towels and toothpaste, air conditioner - all provided and superb conditioning! The roof is a wonderful bonus- a great place to hang out with snacks and drinks and watch the sunset.
Host: Shin is such an awesome, accessible, and helpful host. Very good at giving recommendations of places to visit. Always willing to help and go out of his way when I had mild troubles - trying to figure out what was laundry detergent and requesting a pair of scissors and tape.
Check out the Ninja House! 100% recommended.