The place and the service offered are both great.
Out from the places I stayed in Japan, this was easily the best one. The neighbourhood where it is located has easy access to two train stations from which you could get to large hubs such as Shinjuku in around 40 minutes.
The space itself is very comfortable and clean. Th bathroom was larger than average and its fully equipped. It's got a working air conditioner and even two TVs.
One extra thing that makes it comfortable is that it has direct access from the street, which means that you won't need to carry luggage up and down stairs.
Finally, the most important element of them all will be your host. Chieko. She will work for you to have a great experience in Tokyo, whether it is guidance on how to navigate Tokyo's railway system or help with anything related with the place, she will be able to assist you. However, beyond that, she is a person whose niceness is to great to put down in words.
I would not only recommend you Chieko's place, I will be looking to stay at this location the next time I visit Tokyo.