I thought my capsule looked like a cryosleep chamber on a space flight.
In spite of its small dimensions and cocooned interior, it had all the basic hotel amenities: a USB charging port, a dial to control the light, and two small shelves to hold my phone and any other valuables I chose not to store in the locker room.
The capsule was also fairly comfortable, though this is obviously my personal opinion. I'm 5 feet 8 inches tall and had a fairly easy time fitting into the capsule.
If you're taller or have lankier limbs, you might have to bend your knees to prevent your feet from dangling over the edge.
The lack of space in capsule hotels didn't come as a complete surprise since many apartments in major Japanese cities are very small. However, I wouldn't recommend capsule hotels for those with claustrophobia.
When I pulled the blind down, I became very aware of just how tight my pod was.