Visited on May 20.
After having issues with the last 2 AVIA Volt locations, here the app finally worked.
In fact everything was worked as well as it should. Even the touchscreen and clumsy UI was working. It was still extremely difficult to use the language selector due to the small buttons, but at least when touching a button it would immediately switch to that language and close the dropdown.
The parking spaces in front of the charger don't have any special signage.