We stayed at Shinichi's apartment for about one month just after we moved to Tokyo from Hong Kong. I just would like to say- we had a great experience at Shinichi's apartment. Shinichi is a very responsible and thoughtful host. We would definitely like to recommend his apartment to couple or 3 people family.
In details, his apartment is located between JR Gotanda and Oosaki station, access to either station is convenient about 6-7 minutes walking distance. You can find a big super-market just beside the apartment and if you have kids, it's also a nice area for kids walking to a small but lovely park. My son went to that park almost everyday.
The room is at 10F and facing south so we enjoyed sunshine everything sunny day. Also there is no high obstacle in front of the building (especially from F10), so the view from balcony is amazing.
The room is very clean just like you saw on the website, with one living room and one bedroom. The facilities are simple for practical use. We only bought couple bowls at 100 yen shop and didn't feel any inconvenience during our staying.
Thank you Shinichi for your nice apartment and your kindness.