One of the best ways to stay safe is to learn how to do so by reading the book by the renowned expert, Gavin De Becker, The Gift of Fear. I'm re-reading it, read it 10-12 years ago at the insistance of a good friend. The information has served me well. A little "clanging" helps, too. I have a canister...ok, two...of mace that I carry at times, depending on the situation. I've discovered that the really bad people know what mace looks like, even if you hide it in your hand. They back off.
I think it is great that you have that apartment by yourself. What a wonderful thing that will be. Who could possibly be a match for you right now anyways? You are so unique, a room-mate would likely drive you nuts. Don't worry about furniture. It will come, bit by bit. I lived for a while with a peach crate as a night stand, a folding chair and a card table for my kitchen furniture. It works. It will do. As will your reasonably priced clothes. Save your money (if there is any after rent and food!) for your future.