Services roads marked private inside l' Ancien arsenal du Charroi are accessible by foot with this spectific hours regulation : 

https://www.mapillary.com/app/?pKey=764013065936583

Footway near the appartements https://www.openstreetmap.org/way/405143099 is more than probably private https://www.mapillary.com/app/?pKey=1454073565540455 (i can double check this next week)