Professor Apostolellis is a very nice man himself. He was very open to all questions, and kept the class environment upbeat and light. However, I am not sure if he was very effective in teaching computer science. There was a lot I learned from my own textbook readings and my friends than from his lectures, and the 1111 tests were stressful as we had to handwrite all code. This, however, I think is more the nature of the course rather than the professor. Overall, he was nice and fair in grading, and was always patient and ready to help students.