Mine would be:
1. Attack on the Burrow: Don't really care for the 'Attack' part, they could have left that out for me. (it's like 3 flames and 2 characters I don't care about) but apart from that that set is amazing. Love the slanted upper stories, all the Quidditch details. Might buy two.
2. Room of Requirement: They've done so much in such a little set. love the different torso's and it's only 20 euros :D
3. Astronomy Tower: I love the figures that you get in this set. I just like them not being all roby. Also the look of the AT itself is cool.
4. Hedwich: Don't know why but I just really like this one. I thought I would hate it but turns out I don't.
5. Privet Drive: it's like ranking your children :P Love all the details, and the fact that they did multiple scenes in one build. (I try to do that as well because of room constraints)
6. Forbidden Forest: I'm not as fond of it as the others, but I like that we get centaurs and Hermione in my favorite outfit of hers. (That shirt was my gay-aweakeing ngl)