The room, bathroom and the house: The room is very comfortable and clean and so is the bathroom. It is fantastic that Thao has visual instructions for guests on how to use shower, air conditionning, etc. Communication was perfect, was always asking me if I needed anything, etc.
Location: I was worried it wasnt in the center of Tokyo but it ended being perfect because subway station just a mere meters from house and public transportation is efficient in Tokyo. It´s only a few stations from Ueno station. House is easy to find, Thao gives you clear instructions to find house from the moment you descend the subway. bravo!
You have a supermarket just meters from the house. Very very safe location as well (But I never felt unsafe in Japan at all anyways, all the opposite).
I would stay again at Thao´s place if I come back to Tokyo.