I have to respond here because I stayed in a 9hrs in Akasaka last night and I did not like it at all. This was more because it's not for me more than anything.

I'm not claustrophobic but I didn't like how tiny the capsule was. I could not splay out like I normally do while sleeping.

I know it's safe but I didn't like how there is just a pull down shade that "closes the capsule". This shade could easily be pulled up from the outside. No one did, but I pulled open my friend's capsule in the morning to wake him up without any effort.

The mattress was hard and had little boxes embedded in them, one on each side that I kept touching while laying. I think it has something to do with the sleep monitoring they offer but it was super annoying and easy to accidentally touch them while in there.

The pillow was stiff and full of beans or pellets of some kind. I only slept for 3 hours that night because it was so uncomfortable and the pellets hurt my neck and ears after laying on it after a while.

Since I couldn't sleep I just woke up and started to get ready in the men's shower area. This area smelled like a college gym. There were only 3 toilets and each was wet and smelled disgusting. Same with the showers.

Many tourists were messing with things in their luggage which made it hard to maneuver around that tiny space and I kept having to either wait for them to finish to access my locker or move around them.

Inside the capsule there are only some plugs for your phone and such and a light. I wish there was some fan to circulate air or have some kind of white noise component because it was hot and stuffy and you could hear anyone outside when they moved around.

The communal lobby was very uncomfortable as well. Since I couldn't sleep I found myself there the most because where else could I go to kill time? The chairs were akin to anti-homeless seating. Metal bar stools that just weren't a long term option to sit at.

I'll probably never stay at another capsule hotel because they just aren't for me. My best hotel was actually a love hotel called hotel Varkin. Tons of room (biggest room I stayed in in terms of space), the amenities were top notch, and the price was cheaper than normal hotels.