I stayed at the Airbnb alone for a week and for the price and location, it was perfect! It has all the things you need and is clean. But the room is tiny so if you have a lot of luggage, a big suitcase or are two people it could get cramped a bit.
Had only one slightly weird encounter when the cleaning lady opened the door days before checking out, as she thought my checkout date was on that day.
In general, perfect if you are only looking for a small, affordable, and clean room to sleep, as you will probably be traveling through Tokyo the whole day.