Unfortunately I was not able to contact the organizer to clarify the exact meetup place.
MB, if you are reading this then please update the location with the one you've had in mind, otherwise I suggest everyone meet at a place with a fitting name "Rathaus-Cafe" (https://goo.gl/maps/CBD2U9wew5CAjhgo6).
This year's ACX Meetup everywhere in Zurich, Switzerland.
Location: Rathaus-Cafe at Limmatquai 61
Contact: acxzurich@proton.me