Home Share in Japan

[Aletango]

Hi all, this is the first time I' opening a new thread, but I didn't find out something similar... Anyway... I'm from Italy, Milan, and together with my boyfriend we would paly host to a japanese couple. Do you know any japanese site (where I can speak english, of course) where I can post this adv?
It can be a good idea to share hospitality each other... language, food, culture and so on...
Thanks in advance to everybody!
Alex