If you want a "decent" place I don't think you're going to get anything any cheaper than just getting into an area hotel for the week. You should be able to negotiate with most local hotels for 1 weeks for 2-4 rooms/ block. Don't know if there is a residence inn kind of place around there.
A private home generally is not going to be big enough to house 6-8 people just for 1 week. You'll end up paying for a whole month, just for 1 week- I think.
Good luck though...