I spent two months in the flat while visiting Tokyo for work.
The flat is ideally located in a very quiet and authentic neighbourhood. There are a drugstore and supermarket literally 2 min walk away. Metro access is convenient.
The flat itself is small but very well-equipped (independent bathroom and toilets, washing machine, microwave, rice cooker and boiler). It was generally clean when I checked-in, though the kitchenware required extra washing. Note that the flat would really be too small for three people.
Communication with the property manager is fast and efficient. Check-in instructions were extremely clear.
I would consider staying at this place again for a future trip to Tokyo.