What makes the perfect italki teacher (this question again!)? (It's about learning any language)

This morning I read the article here: 

http://braziliangringo.com/teacher-questions/#disqus_thread

 

What do you think about that questionnaire for teachers? Do you think ALL those questions make sense? Do you think it's possible to find an online teacher who meets those high standards? How much could his/her lessons cost?