I agree with the comments before mine, another good thing you can do is light sage and walk around with it and just visualize pure white energy expanding and cleansing the apartment or house. It's a good way to bring light in and if there is anything there that isn't friendly, so to speak, you would kinda catch it in the mist . If that makes sense ( metaphorically ).
Another good thing you can do, is keep a lot of plants around inside the place, maybe by the Windows, or just hanging up . To keep a positive atmosphere. If you are into plants and nature that it brightens your day.
But in all honesty, the best thing is to do what you feel would bring the most into your home. Keep and open mind and take from the comments, but do what you feel is more drawing to you .