According to the specified CheekyTrip page, Wengen charges CHF 4.80 per person per night for visitors aged 16 and over, and CHF 3.00 per person per night for visitors under 16. The highest standard adult rate is therefore CHF 4.80. The page does not list accommodation-star tiers or other Wengen-specific rate tiers.
Visitors aged 16 and over pay the standard rate of CHF 4.80 per person per night. Visitors under 16 pay the reduced rate of CHF 3.00 per person per night. No other exemption is stated for Wengen on the specified page.
The page does not state a Wengen-specific Airbnb or short-term-rental rule. It says tourist taxes are normally collected by the hotel on arrival and may vary according to accommodation star rating or length of stay; the Wengen entry itself gives only the two age-based rates and does not mention Airbnb collection or a short-term-rental exemption.