You can reach the chapel of the Pius-Gymnasium via the entrance of Haus Eich (Eupener Str. 136, 52066 Aachen) or via the entrance of the Aachen administration center (Eupener Straße 142, 52066 Aachen).
The community rooms are located behind the Haus Eich (Eupener Str. 136c, 52066 Aachen).
You can find parking spaces on Eupener Straße itself, in front of the Aachen administration center, or in the parking lots of Haus Eich.