This fell beneath my expectations. The space is styled like a college dorm with private rooms and shared bathrooms. One thing that struck me was the strong smell that the bathroom has. In terms of cleanliness, it does not live up my personal standards or the standards of other Airbnb homes that I've stayed at. The floor was sticky and wet. There were stains in the toilet and urinal. During my stay, I did not even shower here. Instead, I hiked out to nearby sento (public bathhouses) and had a far better experience.
The beds were comfortable, but it can get noisy at night with boisterous neighbors and paper-thin walls. My particular room had no natural lighting because it faced an adjacent building, so it felt like living in an office. Wifi was also horrendously slow - I even had difficulty loading map data on my phone.
Correspondence with the host is rapid. Responses typically come within an hour after messaging them, which is good. There were also no problems during check-in and check-out as all the doors in the building are electronically locked.
One last thing that I want to note is that I never got to meet the host face-to-face, not even a picture. All correspondence was done through Airbnb's messaging system. They can see your face through the surveillance camera in the hall. Makes it feel more of a business transaction than a warm welcome.
Overall, would not recommend. Until the host makes further improvements with accommodations and maintenance, spend your money somewhere else. There's a lot to choose from in Tokyo.