Visited yesterday without charging.
The charger is in the public underground parking "Nepomuk". The parking is divided in 2 area, Coop and public. You enter through the Coop side, but if you then continue west the 2 parkings are connectected. There's a foot exit next to the river. There are 2 car exits. Coop customers can exit where the entrance is. If you enter the public area it's a one way and you then exit on the other roundabout next to the river.
It seems like you can park overnight, but you can't access the parking between midnight and 07h. There's 90 minutes free parking.