For these maybe: 1. Apparition (thinking about the place) 2. Floo network 3. To say, "we're going to burrow". I hope 당신 understand this. I can't think of any other reasons right now but i'll 코멘트 if i find more. :)
because it will be weird if herminoe says to her mum "hi mum, can i go to rons house today?" and she says "yes what is the adress?" hermine will be like "um... i... its called... the weaslys house?" and to make it 더 많이 realistic and easier to talk about say if for harry hes lived in 2 places: godrics hollow, 쥐똥 나무속의 식물, 바비큐, privet drive n# 4 so it makes it clearer than harry potters house.