I suspect for conversational classes most of the teachers here will be fine. You can read their bio and approach to teaching to see if they seem to mesh well with your needs. That said, I did take a number of lessons with Sanghwa (https://www.italki.com/en/teacher/5014888/korean) and found her to be a great teacher and made the course fun. I am not yet really conversational in Korean but she is very personable and fun to talk with so might be worth considering.