That's pretty much the sum of it. With only about 100-150 rooms available to them to rent out, they can afford to be pretty picky about who they let their rooms out to.
That being said, if you do get in with them you are laughing. You'd probably be able to rent the room from January to August. And it's furnished. And you only need one month's rent as deposit. There are just so many advantages to doing it that way. You're in a very good position because (A) you have me to tell you that; and (B) Eurocontrol have told you far enough in advance when you will be starting in order for you to get in with them.
If I could have done, I would have stayed with them for the full 8 months. However, because I only got 3 weeks' notice to start, I could never have got a place with them- even if I had have known that they existed.