MyCube by Mystays Asakusa Kuramae Hotel 

I loved my stay here! I'm a big fan of capsule hotels, and this was definitely the nicest one that I've stayed in. All the facilities and pods are impeccably clean and modern, I loved how thoughtfully designed the pods were - it's equipped with quite a lot of under-bed storage (way more than enough for my medium sized checked luggage and shoes), a TV, a handy collapsible shelf, hangers, mirror, dimmable lighting, and charging ports. I also loved that you could both lock your pod and the little locker inside for other valuables. The location is very convenient (right next to the subway station, surrounded by convenience stores), and they provide you with fresh pajamas and a toothbrush daily. Everyone was generally very quiet and respectful as well. I found almost everything about my stay here to be perfect, my only single critique was that I felt really hot when trying to sleep. I visited during the winter, so I think they were blasting the heat - I will say I generally run kind of hot though, so it may just have been me (I haven't noticed many other reviews mentioning it).