The location was very convenient, near a JR station as well as a supermarket that works 24/7.
While we couldn't check-in via tablet as we were instructed initially, after getting a quick response from the host, we went through the process via Airbnb messages, so it wasn't much trouble.
The room was clean and cozy as expected from the pictures. Besides towels, a hairdryer, and an iron, we found (disposable) room slippers as well as toothbrushes in the room when we arrived, which I think was a nice touch.
The only thing we had a bit of trouble with was realizing how to lock the door when leaving the room. Rather than turning the key from the outside, I guess it was meant to be done by pushing the button on the doorknob from the inside and then closing the door. In any case, it didn't take us long to figure it out, so it was alright!
All in all, although we stayed only for 2 nights, it was a pleasant stay, and we might be coming back next time we visit Tokyo too!