We do this with out landlord in a somewhat reverse situation. He has the router and we are on his network. We bounce it through our time machine to extend the range but I understand we are all on the same account. It's great and having the included internet brought our duplex into our price range when we initially moved in. I guess it comes down to how well you will know your neighbors. We've known ours for a few years so we didn't think anything of it. If you're going to constantly worry about it then decline from sharing so you don't have that added stress.