We had a great time at this place! We were travelling as 3 adults and a 2 year old, and it was perfect for our needs. It has a separate bedroom, which our son used, and was perfect, as he could sleep in his own room while we stayed outside and didn't wake him up.
The apartment itself is quite spacious, especially for Tokyo, we had plenty of room for all 4 of us, and 2 large suitcases. The fridge is small, but good, and the microwave works fine. The washing machine works well, and there is washing lines outside on the balcony.