Don't trust tutor referral sites for these reasons.
1. They are not safe!You have to have a stranger in your home or wait during sessions in public places like libraries. They hire whoever fills out their application and assume that the person has the education and background listed in the application.
2. These referral sites have no resources. The tutor shows up with paper, pencil, and maybe a laptop. Maybe you build a relationship with the tutor. However, are you ever going to feel comfortable leaving them alone? You have errands to run and things to do. What if the tutor gets sick or is unavailable when you need him/her?
3. Referral sites/Private Tutors simply cannot offer the flexibility, benefits, safety, and professionalism that a tutoring center can.