If you want to home exchange, apart from staydu I suggest you to try a couchsurfing site or a home exchange website,

About home exchange webistes, there is a free one: www.switchome.org, but has not many homes outside Europe. A much better one if wanting to go to America is www.homeexchange.com and www.homeforexchange.com, which has lots of homes in America.

Have a look and, if interested, I can send you a 10 free trial voucher for this last website. Our add in www.homeforexchange.com is number 374. Our email: illopart@xtec.cat

Good luck in your search!
Imma Llopart