Parvin is AMAZING. I've been going to her for 10+ years; for a long time, she was the only person in town who could do threading, and she was a pro at it.
I agree with everyone else that she is a waxing guru - fast, efficient, and professional. Once or twice I've had to go somewhere else for a wax, and I'm horrified by how much longer it takes and how much more painful it is.
I've been going to her so long now that I can just text her to set an appointment, and she's incredibly flexible and responsive... not to mention her prices can't be beat (cash or check only).