One of my worst and yet best punts was an EE girl who changed the price on arrival, changed the length of the booking at arrival, refused to do agreed services or did them reluctantly, kept asking me if I was coming, kept checking her phone, looking out the window, etc, etc.
She was as FAF, as the OP put it. Looked totally innocent but dressed like a complete tart and I thoroughly enjoyed spending every second of my booking ignoring what she was saying and just shagging her every which way to Tuesday until I was done. I almost booked her again the next week just to repeat but did not have the opportunity as she moved to another location and didn't return.