Kyunga's place was a great home base for myself and two others. The nearest train station was only a few minutes walk away, and a couple of stops away from Shinjuku station. It was also close to many restaurants, convenience and grocery stores. The place itself was clean and tidy when we arrived, and had all the amenities that we needed for our stay.
The only thing to think about is that although the place has 2 separate sleeping areas, it still felt a bit 'cosy' for us 3 guests + luggages. 4 guests may feel a little crowded as we just had enough room for us without too feeling uncomfortable.

Nonetheless we thoroughly enjoyed our stay and any issues or questions we had were dealt with quickly and in a professional manner. I definitely recommend this AirBnb as a place worth checking out for your stay.