The level of knowledge of English and pronunciation during communication is not inferior to the language holder.
The lesson goes calmly, noticing and correctioning all the errors. Given that it is a speaking lesson, it gives more to speak to the student than it says itself, which is very important.
I can recommend Irene as a teacher for students of all levels of language skills, including C1-C2.
There is no doubt that Irene will cope with any difficulty.