Unable to answer "What are the opening hours here?" – Maison de Quartier de Porchefontaine (Community Center) – https://osm.org/node/3790686120 via StreetComplete 58.2:

Actuellement en horaires d'été. Voir photos.

Attached photo(s):
https://westnordost.de/p/226396.jpg
https://westnordost.de/p/226397.jpg
https://westnordost.de/p/226398.jpg
https://westnordost.de/p/226399.jpg