Its 50/50 for me. If its not the girl in the ad. I'd make a fuss and get the rate down cause the girl is still "fuckable".
But there are times its really non-negotiable boilers. And I'd walk. There's one in Underwood notorious for this.
You'll be answered by a different lady at the door and say that the girl you're after is getting ready.
She'd let you in and walk you to the bedroom and ask to wait. Now its awkward to say no as you're already inside.
But do not hesitate to walk out if you don't really like the girl when she comes in.