The host has prepared a fantastic English description how get to the flat and how to use every item (difficult, when electric equipment and toilet (not only simple flush) have only Japanese signs).
Also, there is a free WiFi router that can be used to travel around, not only the flat.
The flat is right in the center of Akasaka with plenty of restaurants and bars and close to 2 tube lines.
The flat is nice for 2 people. It’s also ok for a small family. Theoretically even 5-6 people could sleep in the flat, if you count the number of beds and sleeping sofa.
The furniture is western standard. And the beds are very comfy. There is even a nice balcony with the view from the 10th floor.