Under the same roof

http://www.mangago.zone/read-manga/our_house_love_trouble/

Living together before becoming a couple, most're family affair or taking someone/kid in..
http://www.mangago.zone/home/mangalist/213/

http://www.mangago.zone/read-manga/soko_ni_suwaru_na/

I think this Tag fill ALL your requirements - http://www.mangago.zone/tag/roommates/ Hope you find something worthwhile reading :)