Even our elders who have survived war, death, poverty, and some of life's most harsh challenges believe in ghosts and fear them if they feel a place has such a presence. To make sure such fears don't control how you live, you have to take a rational approach and not believe every place has a haunting presence to it. Do whatever you feel helps, such as your proposition of inviting siblings over. The more home-like a new place feels, the better you'll feel about it. The thing with most ghost-phobias is that you freak yourself out even though there's a rational explanation to things spooking you out.
Don't watch scary movies, keep yourself occupied, find ways to enjoy your new place, and be rational when it comes to things (ie: creaky sounds can be explained, unless you start getting dragged around your apartment by some unseen thing then don't think everything's a haunting). All I know is that if I ever find something "ghostly" in my place, I'll hand them my bills and tell them to pay up if they want to give me crap.

For me, there's just too many things going on to worry if there's a ghost. You'd probably get a good amount of flack from the landlords, but wouldn't hurt to ask if they know of any "previous ghost problems" with the potential places you'll choose. Just say it's a spiritual thing you like to find out about places before you move in.
