Pros
3 day weekend
The curriculum is already given to the teacher
A way to get your foot in the door for a career in languages/education
As a teacher you are encouraged to make classes fun
The schools are all over the SF Bay Area, so they will find something near you if you ask them to do so.
The salary is $35/hour after school and $30/hour if you teach during school hours.
If in curriculum, then it can be 7 hours/day
The chance to teach brilliant students
Cons
No benefits
Holidays are not paid
No travel reimbursement
Part-time work for after-school (1 hour/day)
If it's an after-school class, you only teach at one school once a week. Sometimes your students forget what they learned the next week.
Breaks are not paid
Materials expenses are not reimbursed
Not paid for lesson planning/grading in In curriculum