It's a pretty typical Tokyo apartment - tiny. Everything is organised pretty efficiently though and covers all the basics. The apartment is in a really nice suburb, but you pretty much have to go to the main road or train station area for places to eat, convenience stores, coffee, etc.
It's about a 10 min walk to the station, and only about 5 stops to Shibuya and another stop to Harajuku (Ometosando). Be aware the trains can be pretty packed sometimes.
Host was very responsive and reactive. Great communication.
Only problem I had was the bunk bed mattresses. Way too thin and made it a mission to sleep every night. However, I have mentioned this to Kumina so she can hopefully do something about it.