Hey guys! I've done my internship at NATO! Was a really challenging experience, but I enjoyed it and learned a lot! Of course, experience depends highly on division you will be working in. There were some people who were very happy and others didn't like it at all, some even terminated their internship before it finished. A lot of people get temporary contracts afterwards which lets them gain a little bit of more experience and is good for CV.
Referring to conversations on this board and for the future reference, the interview in the selection procedure happens not every time! Some managers call, some don't and select their interns only based on CV!