Koichi San's place was as advertised. Communication was done clearly and effectively and I had a fuss free and pleasant stay in Tokyo. I managed to place my luggage outside the apartment while it was being cleaned, and the cleaning personnel moved them in for me after they were done. The place was clean, and there are basic items provided (tissue, toilet paper, shampoo, soap etc)
The apartment is located near to Ikebukoro (5mins walk + 10mins train) which is connected to many city areas, making it very easy to travel. Many different things to earn around the apartment, and many amenities shop, 2 supermarkets and 1 convenience store to get some daily necessities during all hours of the day. The neighborhood is very quiet and peaceful. It is also very easy to find.
My only complain will be that the apartment is rather tight for 2 grown adults, making it quite hard to "live" in it. But for a place to just chill after our days in Tokyo, Koichi San's place served the purpose well.