As other have mentioned the bathroom is very small. The three of us range from 5 feet tall to about 5 feet, 3 inches and closing the door was just right. Having said that, there is room in the kitchen area. It was tight and cozy for 3 people sleeping but doable.
The location is great as it's a short walk from the Metro/subway station. Lots of convenience stores nearby.
Self check in was easy, but needed a flashlight/phone to be able to see the lock.
If returning to Tokyo, I would stay again.