First Cabin is always my go-to choice when it comes to Capsule Hotels...!
To enter the property, you must take an elevator to the third floor to check in, then the floor above are the rooms.
Security to the rooms are very secure, shoe lockers & under-bed storage is provided, and the space in the room is VERY adequate.
It says you should check your valuables in the safe, rather than under the bed, but when I wanted my camera to be put there, the staff member at the time didn't understand the request in English, and upon collecting it, I spotted it was kept on a shelf in the backroom, and not a safe.
(It is worth noting, it was kept on a towel, presumably to mitigate any damage when placing it down)
The downside however was during my stay, the heat was unbearable. There was no fan, either blowing or extraction, and it was a constant heat all night.
Aside from the heat, First Cabin Midousuji offers a fantastic capsule experience across Japan, and First Cabin Midousuji is no exception.
I will absolutely be staying again, simply due to First Cabin remaining a fantastic and reliable choice.