My girlfriend and I absolutely loved this apartment! It's in a very central location, a short walk or metro ride from most of what you'll want to do in Tokyo. But at the same time the immediate neighborhood is very sleepy and calm, and a welcome respite from the chaos of the city.
The apartment itself is roomy and well equipped. We cooked breakfast in the kitchen and it had everything we needed. The windows open to provide a nice breeze and the balcony was a welcome treat. The apartment is in a small building with only 5 apartments (one on each floor), and it overlooks a cute little park. The apartment is on the 4th floor and you have to walk up the stairs, so be aware of that if you have mobility issues.
Communication was clear and simple, everything went smoothly. Don't hesitate to book this place, it'll certainly be my first choice on my next trip to Japan.