The apartment from Jay was very well located (10min walk from station taking you very quickly to Shinjuku), very clean and comfortable for a family with 3 big bedroom.
I strongly recommend that place.
The only small inconvenience was about the kitchen stuff/utensils that were not matching the high quality of the place to my opinion, and was not enough for having real dinner at the bnb.
But overall this apartment was very good and communication excellent with Jay.