Pros
Currently a high school intern at Bloomberg. I was offered an internship during the school year and then it carried over to the summer. The internship involves very little management. Not even once, was I ever asked by my mentors "hey what are you doing right now, are you doing work?". They give you an assignment, and trust that you'll be able to do it. They're there to help you out and answer questions, not spoonfeed you Hours are pretty flexible. I came in when I want (never once scolded for being "late" or the like. I actually came in earlier than my seniors a lot of the time). I left when I wanted. Pantry has nice snacks for you to enjoy. Free breakfast. Soups. Good pay, especially for high school ($20/hr). They take you out to events around NYC. Overall, a good internship that looks great on a resume, offers great pay and enjoyable perks, and isn't too difficult to attain/perform at.
Cons
Commute sucks. R&D people are kind of awkward. Open desks (no cubicles, even though they'd be lovely)