It's a decent place and the staff are all wonderful. It's in a good location near Skytree and Asakusa. But I do have to say I didn't have the best time.
First as far as the beds, they are just not very comfortable. The capsules are not individually air conditioned, so if you get a bottom bunk it is very hot, even with the AC blasting in the dorm room, there is just no airflow into individual bunks, unless you are on the top. Also there is no sound proofing, and top bunks have no ceiling, meaning that you hear snoring so much louder here than at other capsule hotels. I've stayed at many capsule hotels, but it was very frustrating with how loud the snoring was. It was like a full orchestra every night!