Tak and Mayu really looked after us, including picking up the whole family (7 people) from Tokyo station and taking us to the house. It's fantastically located, less than a minute's walk from the subway station, with quick access to the fun and electricity of Shinjuku, Shibuya and Harajuku, the nightlife and art of Roppongi, Ginza shopping and food etc.
The apartment is comfortable and stylish, with a view of Tokyo Tower from the window. We managed to cram all 7 of us in with relative comfort.
I'd definitely recommend this place for a Tokyo base.