Mr Hirano San was very helpful, responsive and entertaining, the most accommodating host we have met so far. Thank you very much, the trip to Haneda airport was memorable hahaha.
Location was not ideal for family with small kids though, as it is quite far (1.5km from the nearest Asakusa metro train station). Tobu supermarket is within 1 minute walk make it quite convenient to get groceries (opens 9am-9pm).
Perhaps the apartment itself needs refurbishment and some cleaning to make it better.