Visited on June 10 without charging.
This location is visible in roaming apps without any useful description.
The charger is among the parking spaces in front of the multi-family house. So probably meant for owners and their guests, but there's nothing saying you can or cannot use it publicly. It has the CKW ad-hoc payment instructions.
There are signs for a B&B nearby, but I don't think it's in this building.