We stayed at the AirBnB for 4 nights. The beds were comfortable. The kitchen had 2 pieces each: bowl, plate, mugs, drinking glasses, silverware. Basic cookware, microwave, electric kettle. It was enough for two people to reheat prepared food. Laundry soap, shampoo, body wash were available. Away from the major roads, we had a restful sleep.
From Shinjuku Station, take the WEST Exit. We took a taxi (500 JYP) because we had heavy luggages. The nearest grocery store (not convenience store) is Olympic, 5 minute walk.
We will stay here again when in Shinjuku.