I had a very pleasant stay.
The place was clean and easy to find if you follow Google map with the provided instruction.
Inside the apartment everything you need is provided.
Katzutomi is very responsive and will do everything to fix what you ask for.
I definitely recommend to stay at his place. Freedom, quiet place and only 7 min (for me) to Ogikubo station.
You have a 10 min option to walk to Asagaya station but great area to get lost and discover.
Highly recommended.