That is an incredible offer and opportunity! I was ultimately deciding between Queen's and Carleton's public admin programs...and even though a lot of people (including my references) pushed for Carleton (better funding, better co-op opportunities, better location) I just had a better gut feeling about Queen's. I applied and was accepted to 5 schools, and even though I haven't heard anything about Queen's funding yet (apparently they don't tell you until after you accept?!), I just felt for me it was the strongest and best program.
Maybe I'm being slightly biased (as I know nothing about CEU) but I feel like if you want an opportunity to work in Canadian public policy, going to a highly reputable Canadian school would be best suited for your career goals. Best case scenario, Queen's is a highly respected university on the international scale for public policy so if you're looking for international experiences after it could very well help you in the long run too!
Congrats on your acceptances! Maybe we will be classmates!