This was an excellent apartment in Tokyo. It is in a very well-connected location, a couple of stops from Shinjuku and all the main places one would want to visit in the city (the train station is very close and you can get to most places pretty fast), and plenty of local food, shopping and coffee shops if you want to relax around Hatagaya some days during your trip.
The flat itself is really clean, has a working desk, good wifi, a comfy bed, and Masami is a super responsive and helpful host if you need anything. I was very happy with the apartment as a single traveller and would definitely recommend it to anyone who needs a place to stay in the city!