Improve your listing, speaking, writing and reading skills of a native speaker

I highly recommend Denis as an outstanding English teacher. Their passion, expertise, and commitment to student success make them a valuable asset to any educational institution.

Despite I've only had 4 classes with Denis (by the time) I can assure you that he is a very good teacher.
I decided to give him an opportunity because, despite not having any recommendation or description of his experience as a teacher, in the first class I realized that he has a lot of talent to transmit knowledge, apart from being a very polite and professional but interesting person.
What else can I say?
Just I sincerely recommend him, specially for training your conversation skills and pronunciation (as in my case^^)