The apartment is very close to Nishi Shinjuku station which in only one station away from the main Shinjuku Station - very accessible and very convenient to travel round Tokyo and 1-day trip out of Tokyo. It is in a very safe place, so the two-minute walk along the narrow well-lit lane to the apartment late at night in not an issue for us, 2 ladies and a little girl.
Size-wise, it is roomy enough for the 3 of us, and a cosy breakfast/supper round the tiny table in the kitchenette.