I personally find it appropriate for Berkeley Review to recommend Wyzant; however, I would say that Wyzant is essentially a
match-making service where you can view which tutors are available AND the tutors' profiles. The quality of the tutor you get
depends on who's available and who you choose. It's definitely worth giving a Wyzant tutor a try because there's a money back guarantee for the first hour. (If I remember right, that guarantee might have a $100 limit, but still that's going to cover it for the vast majority of tutors. Each tutor sets his own price and you can see that before emailing or hiring.)
IMO, Wyzant is reputable, honest, efficient, and offers a
wide variety of tutors for almost any subject imaginable. I've hired Wyzant tutors many times in multiple subjects. I'll get back to you if I find a specific VR tutor I like.
www.wyzant.com