Conveniently located in between JR Shinjuku and Shin-Okubo (Korea town) station. Close to
Don Quijote store where you can buy basically anything. It is a 3 story building with 4 bedrooms each with ACs. Stairs are a bit narrow but it's good exercise (LOL). Small living /dining space compared to the amount of bedrooms so we recommend to eat out since there are lots of good restaurants nearby. The downside to being next to a busy street is that it can get a bit noisy at night. Great wifi. There's also a washer-dryer combo machine, but we suggest you hang-dry your clothes on the third floor balcony (traditional Japanese way).
As for nearby restaurant recommendations, we suggest Kurumu and Tonchan.
There are also many convenience stores nearby, our favorite is the nearest Family-mart across Don Quijote.
As for walking to Shinjuku station, it's the quickest if you walk along the railway.
Overall really nice, thanks!