Lovely place to stay in Shin-Okubo. Very close to station, easy to find. And it is quiet! Great eateries nearby, and Family Mart & a supermarket. It is a new apartment, so it is very clean and neat. Bathroom is very good and the shower unit with the 'dryer' function is great for washing and drying the family clothes. Beds were comfortable (firm) and clean.
Easy to self check in. Great communications with the host.
If I had to be picky, there is limited room for your luggage, especially as we were a family of 4 travelling and had 3 medium to large suitcases....but this is being ultra picky! And is no way a major criticism. There is a cafe downstairs in the basement area.
Overall a great place to stay....and I would highly recommend.