<p>While it would be inconvenient for everyone else to have someone living in the living room, I think it would be even more inconvenient for the person who is actually living in the living room (zero privacy), so they should perhaps pay the least?</p>
<p>What if someone needs a drink of water in the middle of the night, or needs some drunk snacks at 2am? That would get old. They essentially do not have a room of their own.</p>
<p>Are either of the two in the double sexually active? If someone wants the room for a night or needs some privacy for a bit, the other roommate would have nowhere to go (no living room).</p>
<p>This sounds like a bad situation. The person in the single does not want to pay more? Is this the first time they have lived in an apartment? Because of course someone in a single needs to pay more!</p>
<p>I’ve seen a lot of apartment situations start off complicated and rocky like this, and usually things do NOT get any better. :/</p>