Great quiz! I was planning on making this but now I don't have too! Hooray! My favorite area...hmm...probably Upper Latria. Amazing atmosphere, amazing design, interesting lore, just all around great. Inner Ward is a close second, but loses out due to being much less memorable in terms of atmosphere. My least favorite was VERY easy to choose. You know it, you probably hate it too, it's the Swamp Of Sorrow (VERY fitting name). One of the worst areas in any game I've ever played, which sucks because the atmosphere and lore are really great. The gameplay is just so unbelievably awful that nothing can possibly save it. It's honestly not as bad as everyone online says it is, but it's pretty close to it.
Thank you for enjoying! Definitely agree with you on the Swamp of Sorrow, although at least with the Thief Ring the parts involving the larger guys are way easier to manage, thank god! My favourite area to play through is definitely the Inner Ward, though for pure aesthetics, Upper Latria wins that battle easily!