If you are leaving Zurich airport early in the morning or arriving late in the evening, then the Capsule hotel is great. The location cannot be beat. It is right across from check-in terminal 1 (Swiss Air).
The shower was great and there are a good number of them.
I do not like the capsules, however. I left my door open a crack so I would not feel like I was in a sensory depravation chamber. I wish that I could have had control over the ventilation. The capsules are pitch dark, when the lights are out, and you are given a pair of earplugs. That doesn’t help when someone climbs into the upper capsule, slams the door and the whole unit shakes.
Personally, I prefer hostels with bunk beds. If I hadn’t had a flight, I would have stayed at the Old Town Hostel Otter. They have privacy curtains on the bunk beds, which are much less claustrophobia inducing.