This is a great, recently renovated place in a fantastic location. Compared to other options in the area it definitely stands out for larger groups. We had 6 people staying and it was pretty crowded, but manageable. The fact it had 2 showers and 2 toilets was amazing.
One pretty major issue we had was the fact that the fluorescent light in the stairway can't be turned off. It's apparently an 'emergency light' which shines brightly into the downstairs area and quite directly onto one of the beds. I'm guessing it's a result of Japan applying hotel regulations onto AirBnB's but it was incredibly stupid. Bring some tape and something to cover it, otherwise you won't be able to sleep.