Kasumi's place is absolutely wonderful. It has lots of little personal touches and the layout is well thought out to be a relaxing and livable space without having so many things you lose space for your own stuff!
The location is a wonderful place where the girls will enjoy the huge mall with lots of unique restaurants and it's extremely close to the big metro and activity hub Shinjuku!
I absolutely recommend this apartment and Kasumi is a wonderful and thoughtful host! I hope you can enjoy your stay as much as I did!