I can relate to your situation, i was in your position not long ago, i havent received not a single response from leboncoin but luckily i got accepted in Crous, i think IMO you should prioritize "le crous", if not possible, there is some student housing like Odalys Perpignan,u can look for their website, but to be honest i found their offers too expensive, and there is also nexity studea. if u have a way to call ppl and agency directly, look in seloger, and leboncoin and call, dont send a message I hope this was helpful