As far as my knowledge of the subject goes, the Vienna settlement refers to the Vienna Congress of 1815. The Congress was held to settle the aftermaths of Napoleonic Wars. There’s a whole chapter dedicated to it in Sheikh Qayyum’s Book, Chapter # 17 to be more specific.
Gladstone’s policy of “killing home rule by kindness” actually refers to his Irish policy during early 1880s (second time PMship). Through this policy he attempted to halt the Irish efforts of “home rule” by social amelioration. It was committed to deal with land ownership, local government and social reforms. You can find more information about the topic by specifying your search query on the internet, as even I couldn’t manage to extract good information from the mentioned books when I prepared for the subject.