I am the tennis instructor for the UAH health/phys. education class and the OLLI seniors tennis class. I've worked with beginning, high school, up to Div. 2 college players. I guarantee improvement (and hopefully fun playing tennis, as well).
Really cares that you learn and make improvements!
Excellent knowledge and good at explaining.
First, I want to understand goals (particularly for kids/juniors who may want to make the high school team, go on to play college tennis, etc.). Next, learn about strengths/weaknesses in terms of actual tennis, skill level, and so on -- then work via drilling and play from there.