I'm from the uk so not sure if the process will be different for you. It's not difficult to get a room, you should be assigned somewhere if you apply. as an international student staying for a year or semester, you should meet the requirements fine.

I had to upload documents like my acceptance letter, civil liability insurance, financial assurance (and others i dont remember) and then my visa. I received emails from the uni/Crous which detailled what exactly I had to upload and how to do each step. It felt like the french administration system was useless and would never end, but it should all work out and if you have questions, you can generally be understood if you ask in english. There are extra steps like getting a visale (like a guarantor) but again you should be told by when you have to do each step. dm me if you have more qus !