Visited on October 12 and charged ad-hoc.
This charger was briefly visible in July on IchTankeStrom, and presumably in the eCarUp app. Since then it was removed, but I noticed the payment link was still valid.
The charger is on the side of the building, there isn't anything posted, and no parking spaces painted.
The operator name on eCarUp is "SyEnergy AG", but this doesn't really help identify who the charger is for, as this is probably just the name of the company that installed the charger for them.
While there are no QR codes on stickers, if you choose a connector on the screen it shows you the QR code, which match with the charger ID that was visible in the past. If you try to open the link with the eCarUp app it says "not authorized", but if you open in a browser it lets you start an ad-hoc session.
Since my test charge, the payment link always shows "Unfortunately, this charging station is currently not available". I wonder if they disabled the charger, was it after they noticed someone had used it? 🤔