I bet the place that she is staying in right now ain't taking pussy payments.
Its not her house.
She pays 1800/month right now to someone who doesn't explain a damn thing to her. She's about to pay damn near 2000.
If they are in a relationship, its a given that he would explain whatever to her but its not her house and right now, she has no "rights" to his home. He seems to be doing fine and didn't ask for a roommate.
If he gives her a number she should be cool with it if its not too high. $800 seems reasonable.
He's probably going to stuff that money in an account somewhere and when shit breaks down (car/pipes/whatever), he'll just pay it. When they want to go on a trip - done. She wants that new bag but is short - boom. Bag bagged. If their relationship goes next level, she will stop paying anyway. WE KNOW THIS ABOUT Y'ALL. So what da problem iz?