Firstly, big thank to Sayaka and Riku.
The location is 23min walk from the main station Shinjuku but it is near shini shinjuku station- a local station and can connect to the big ones. It is also near many bus stop which make plus point for the apartment.
The apartment is old, clean around 3 and 3 1/2 star. 1 lamp in the kitchen is broken so the 25m2 apartment is not had enough light yo use.
The owner provided everything that she point and it is easier for renter.
The building is not have elevator so who have big luggages please carefully thinking.
To sum up, the apartment is ok which location and renting price.