Should I be renting that house, I'd be out of there as soon as I could, dragging a pair of cats on a leash and carrying a sewing machine in one hand.
If I owned it, I'd remember my Grandma's hillbilly answer to an invasion of snakes, I'd rent out my yard with fence to someone with a few pigs. They love snakes, and very shortly would make the place unpopular for the slithery, unwelcome guests. And I've heard from others that cats will kill a lot of them, though I'll admit that I've never seen that before.