After each job is over, you can log into your account and leave feedback on the most recent job. Just log in at tidy.com and press either Needs Work or Loved It.
You will also receive an email after each job is completed that you can use to leave feedback.
While most pros (obviously) prefer positive reviews, many still like to hear constructive feedback whenever possible.
There are various things you can do if you are not satisfied with a job:
To learn more about options if you are very unsatisfied, see Satisfaction Guarantee, Disputes, & Protection