Amazing place right downtown; perfect home base for longer trips. Excellent condition; spotless. Real kitchen for home cooking, and a laundry machine. No bathub.
Walkable distance to Ikebukuro, a main downtown hub, with super-convenient access to Tokyo's "greatest hits": Shinjuku (one station), Shibuya, Harajuku, Shinokubo, Meguro, Ebisu, Asakasa, etc.
The apartment is an extremely authentic, spotless, renovated typical Japanese residence, with traditional furnishings (tatami mats, floor cushions - "zabuton," floor-bedding - "futon," separate rooms for both of the toilets) and some western touches (one double bed, a kitchen table). "Full immersion" experience, living like a local, but still close enough to the action for daily sightseeing. Oyama's shopping/restaurant area (shotengai; 15 min walk) is full of hidden gems.
Winter Warning:
Shower room isn't heated, so it's cold (common in Japan; likely a deal breaker for most Westerners).
2-5 people: great. 6-9 people: very cramped.