I have two Master's degrees from American universities, and was born and raised there. I am willing to talk as many hours per week as you need, and (as a former teacher) am more than happy to help you identify areas you are interested in improving and work with you to meet your language goals.
I am a very easy going guy, and have lived in different places in the U.S, which gives me the ability to explain different "Americanisms" as well. I am also willing to negotiate on pricing. I want this to be an affordable and excellent experience for you, while also being comfortable.