The host responded frequently but it wasn't ever anything helpful, they just told me to refer to the manual most of the time. If you don't have a phone number you can't call them and it's a lot harder to communicate through text.
The instructions sent to me had a few *major* errors like the address at the top of the page (in Japanese), so when I took a taxi we had to eventually call the number to properly find the location.
It's a nice location and has all the facilities you need but the walls are super thin that when people talk it feels like they're talking right next to you, you can hear everything from upstairs neighbours to people on the street. Sleeping was a nightmare.
The hot water also randomly went off whilst I was in the middle of using it which was a horrible experience. There's no heater too so I wouldn't recommend staying here for winter, so cold.
I wouldn't recommend staying here long term, one or two nights might be nice but other than that, nope. I was staying for 10 nights and was only provided 2 toilet rolls and one tissue box.
Doing the rubbish for a longer stay was also a nightmare.
You get what you pay for. Never using Airbnb again in Tokyo.