This is definitely a cozy spot. As mentioned above, it is a studio. However, theres wifi and a pc to which Sohei gives you access to, along with his Netflix account! Fridge, stove, large shower, bidet, washer and dryer(!!!), microwave. The place has everything you need realistically.
Take in mind however: it is about an hour train ride to Shinjuku station from the Kamegawa station. So its definitely in the suburbs. Theres 2 grocery stores and a discount grocery store within walking distance. Def bring a pillow. Obvi there's some provided BUT they're not the best(I have a tempurpedic). Theres a futon, about full size, and two floor beds, about twin size.
Anywho, all in all he waited till midnight till we got there cause hes great! We would def stay here again!