I have hosted 2 students in last year's interview season and plan to host again this year.
Use your common sense--don't make a mess, don't run up the phone bill, make nice with the spouse or roommate if there is one. A very little something for your host would be nice but not required, and then a follow up thank you card. That would go a long way to having that resident root for you at the end of the season with the PD.
Oh, and offer to wash the resident's car and do their laundry, and come bearing good wine.....i kid, i kid.