The units are individual rooms and there are 3 on each floor with a lift opening thats not private (ie anyone can pop in and A delivery man did) so if you have a big group then do note that it isnt very private unless u shut the room doors like a hotel.
On the plus side location is a
Great with a 2 min walk to The Yamanote line train station. The toilets were clean and nice with good toiletries provided.
However the curtains and walls were dusty and gave us runny noses in the morning from allergies. If this can be sorted it would really improve the stay. Kitchen was also ill equipped with disposables provided and some bowls still oily. If you dont expect to cook much itll be ok.