Fine outdoors store, right on the way to the Klettersteig. They advertise "4 floors", which is…read morefairly normal --- but this time around it's the ground floor, one above, and then two basements. Rental gear is in the first basement.
Klettersteig / via ferrata gear in the summer is fairly straightforward, and CHF20 for the day --- cheaper than I'd expected. New-style EPS helmet (rather than hard plastic), a harness with speed buckles, and a progressive-tear via ferrata setup; mostly very-new-looking Petzl gear.
Front desk staff was polite, if uninterested in dealing with rental customers; the rental desk was much more friendly.