Kaoru's communication was really good from start to finish. He met us at the apartment shortly after we arrived, to explain everything we needed to know. This was exceptionally kind, as it was on a workday for him. Also, halfway in to our stay, he contacted us to check if we had any questions and if we needed any help at all.
The apartment is very clean, modern, and was very comfortable for the two of us. It has all facilities needed, including a full kitchen, which we didn't use. It's also surprisingly quiet.
Location of Kaoru's apartment is great. It's a short 10 minutes walk to the local JR station, and closer to the private subway. Access to the property is clearly explained via photos and descriptions, which made it easier to find.
We would definitely stay again, when next in Tokyo. Thanks Kaoru!