We spent 1 week in this appartment.
It is spacious, clean and the host provides with everything we need (wash machine, bed sheets, towels, cutlery...).
We enjoyed our stay and felt like home!
The only inconvenient thing is that the appartment is a little bit far from the center and we needed to make 2 changes because it is not on Tokyo subway line. Also we could hear the traffic road while sleeping but it's ok with ears plugs ;)
Other than that, everything was perfect, thank you Masaru!