I’m currently a French student and I have the opportunity to make an internship in a Kosen University for Three month

Hey guys, I’m in my second year of higher education (21 years old) and I’m going to make an internship in Fukuoka with my girlfriend. We don’t know where to start looking for a place to stay it’s hard to find any kind of information on internet. Do you think it’s easier to take a place on-campus or in the city ? Do you have any other advices or informations for us before moving in Japan ? Thanks you