I stayed almost a month at Kimmy and Dee's place.
Great location in an exciting part of Tokyo w/o many tourists but with great restaurants nearby.
The JR station is easily accessible - appr. Seven minutes walk and connect you with Shinjuku in 10-15 minutes.
The apartment has all the needed amenities and would fit 1-2 persons. I stayed there alone and had no problems. Two persons would also be OK, but more would be VERY cramped.
K&D were very responsive and provided excellent guidance.
I can only wholeheartedly recommend staying here.