This was my 1st capsule experience. Interesting to say the least. The capsule's curtain leaves a 4" gap of visibility (due to Swiss safety regulations) so you're not completely closed off from view if someone walking by wanted to be nosy. The bathrooms were clean (I used the shower, ect early as to avoid any possibility of a crowd - but was told by other guests they have never ran into any problems of the sort).
The only thing I'd say that might be something to look into expanding a kitchenette area as there's basically a coffee machine to use.
The main thing that can not be argued is the value. Zurich is a very expensive city, so this will definitely help you save the cash. Would stay again. 5/5