Unable to answer "What are the opening hours here?" – Croix-Rouge française - Unité locale d'Issy-les-Moulineaux (NGO Office) – https://osm.org/node/5076303445 via StreetComplete 59.1:

Emplacement vide mais ce n'est pas un local commercial

Attached photo(s):
https://westnordost.de/p/246933.jpg