It was clean, there was everything you could need for your staying and the position is very good (the center of Shinjuku with literally every kind of restaurants and shops only 15 mins by foot).
I've really enoyed it and would stay again if I could. Recommended without doubts!
It's on 3rd floor and with large baggage it could be difficult but the staff kindly helped us pick them up nevertheless. You can leave your baggage before check-in and after check-out too.