What makes you think you have any kind of right to choose who lives next to you, or to have a say in what they do with their property? If you take Airbnb out of the equation, the assertion is ridiculous.
I have a right to say no to AirBnB. Does my individual opinion matter? Probably not. Does the collective opinion of my neighborhood matter? Yeah it kind of does.
We've been saying no to AirBnB for years, this isn't anything new. NYC says yes but for some reason the rest of the world thinks we're wrong to choose how we want to live.
If your neighbor has a friend stay with them, and their lease allows it, you have no say in the matter. It's their property rights, which flow to them from upstream property/rights owners.
This is no different. Your right end where their rights begin, which I'd say start right around where their property lines/walls are.
