Pretty easy, overall.
Flores is a pretty sweet dude. He's rather quirky while giving lectures, however, that makes them enjoyable (it beats sitting through a 2 hour monotone lecture).
His tests are rather easy - if you do the homeworks and quizzes, you should have no problem getting an A on the tests.
Hours per week:
Advice for students:
In 4 years, he's one of the best teachers I've had.