^ Thanks I'll read into that. Looks promising
My router does allow for making a guest network and keeping it totally separate from my network. I think I will do that for now, and buy a cheap DD-WRT compatible router, and use it to give them WiFi access. I'm looking into getting a cheap DD-WRT compatible router to set up as a repeater + use it to limit their bandwidth via MACid/IP .. looks like that's the cheapest/best solution