Great location, a lot of eating places nearby. FamilyMart is just downstairs. A supermarket is around 700m away. Nishin-Shinjuku station is 3 min walking, and Shinjuku station is around 10 min.
Good communication with Dong, always got the prompt responses.
Check in/out is easy and straight forward.
Overall, we were very happy with our stay in Dong's apartment.