The apartment is amazing, 3 floors with 4 single beds and a double bed. 1 full bathroom and one more with Wc. It is perfectly equipped with air conditioning in all rooms and living room, washer and dryer, full kitchen with microwave, tv and wifi in the house and portable.
Derek is a fabastic host, welcomes you near the apartment and accompanies you to him to explain everything in detail. Metro stop 2 minutes walk, supermarkets and restaurants very close.
In short the best option I could take in my stay in Tokyo, I would repeat.