I enjoyed being in a professional environment because it gave me a glimpse of what the real industry is like, the ability to work with some big name clients, as well as confirming that I want to be an audio engineer.
What I wish was different
I wish that it had been a paid internship; however, I understand that the music industry is not the most financially rewarding.
Advice
Be prepared to work very hard and at an efficient pace. Also I would say ask as many questions as possible in order to learn as much as you can because no one is going to hold your hand through it.