What sorts of programs are there for hosting foreign students?

My family and I would like to host a foreign student in our home, specifically, one from Japan. The student would have a private bedroom, laundry, Wi-Fi, and two meals a day (breakfast and dinner), which I believe is a requirement for most programs, anyways. Our problem is that we can't seem to find a good program that would fit us. We would prefer to host the student during summer vacation (June-Septemberish), and we would prefer to have a Japanese student (gender does not matter). All the programs I've found are either a longer commitment than summer or have countries other than Japan, or are not available for our area (San Francisco Bay Area), maybe because there's already a large multiethnic community here. But if you can suggest one that has a summer timeline, is hosting in CA and has students from Japan, that would be most appreciated. Best answer will be chosen.^^