狭い___、居心地のいい部屋だ。
Q. Which connective expresses 'though (small), yet...'?
Translation
Though small, it's a cozy room.
Explanation
〜ながらも concedes a fact while asserting a contrast: 狭いながらも 'small as it is'. ばかりか and のみならず add information ('not only'), and どころか escalates a denial.