We were 3 adults and the place was perfect. Very spacious and convenient. Tatami beds were absolutely comfortable. The place was super clean and there was even a cleaning service every day.
The place is conveniently located, 10 mins walk from Shinjuku and 5 mins walk to kabuchiko. Also 2 metro lines within 200m. From the apartment. The neighborhood is quiet and full of convenience stores and restaurants.
We would totally stay again at Andy’s place when we’re back in Tokyo.