The room is a newly refurbished 1K (single room with kitchen) apartment. Imagine a small hotel room with an included kitchen and you'll get the idea. Everything was like new. Syuka's communication was excellent, sending detailed pictures on the day of arrival. She also replies very quickly to questions. It's worth checking the pictures she sends a few times carefully if you're not used to Japanese apartments, and even if you are. This even caught me out, as I didn't check carefully and didn't realise that the particular type of washlet used on the toilet requires that the hot water be switched on to fully work!
The area of Nakano is reasonably quiet. You can hear some train noise, but it isn't loud. The room also has metal shutters on all the windows, which can reduce noise (and light) further. The location is incredibly convenient, being near a supermarket and the Nakano Sun Plaza, yet just far enough away from the restaurants to be sufficiently quiet and secure.
The next time I'm staying in Tokyo I hope to stay at Syuka's place again as it was a wonderful experience.