Pros
I interned here for three months during the fall of 2014. I did not know what to expect so I was happy to find out that ClassWish was a good place to intern. My tasks were mostly interesting, and every time I showed some extra initiative, I got more responsibility. It helped me to be a better employee, I think! The co-founder was always around, and there were never any problems with asking him for help or extra guidance. He has been in the "game" for a long time, and has a lot of knowledge and experience. And it is also worth mentioning that the office is midtown Manhattan!
Cons
If you do not take initiative you will soon find out that you run out of tasks. The co-founder has a million things on his mind, so you need to be able to think on your own. Unpaid.