The bathroom had a pretty noticeable presence of mold/mildew present in it. I am not sure how this was missed, but every time you walked in it smelled pretty bad. There were spots of mold as well. The walls are a bit thin and it is kinda loud. I am not bothered by this, but some might be. But these were my only issues though.
The space is otherwise quite nice. The wifi was mobile and it was nice to be able to take it with me throughout the city. Lots of good food in the area and things to do. I was unaware that Shinjuku is Tokyo's redlight district, but I think it is important for people to be aware of that this area is perhaps not suitable for family/kids. Kelly also was very helpful and although we couldn't communicate very well, she was friendly and thoughtful.