[GT40FIED]

Generally it's best to keep it in one room for about a week or so. Let it get used to that one room (preferably where it's food and/or litter box is) and then slowly let it venture out into the rest of the house/apartment. We've got 2 cats at my mom's house and even though they were about 7 when we moved to a new house, they still freaked out. We kept them in a room with their litter box and food and water for a couple days and eventually let them explore the rest of the house at their own pace. But when we first got them we kept them in the basement for about 2 weeks and then slowly let them into the rest of the house. Just make sure that while you're letting them get used to the one room you give them plenty of attention.