Great location and the apartment is really close to the subway station which is about 10 minutes walk. Along the way, you would pass by a supermarket , Lawson , restaurants etc.
From Saya's apartment, we could also walk to shinjuku by foot without having to take train ,which is approximately 20 mins.
For the room size , it is adequate for two person and personally , I find that her place is rather cozy and quiet to stay in.
As for Saya , she is very responsive and also allowed us to check in slightly earlier ( the day we arrived , it was raining heavily w a temperature of 12 degree) on day 1.
All in all, this is an excellent stay for us and we would love to come back to this apartment next year same period.