Think about which furniture is important to you. If you want the opportunity to invite to social gatherings, it can be a good idea to invest in a chairbed instead of a bed. Then you create the opportunity to hang by the couch and have space with a dining table in your apartment. If you would rather have a large bed, you can invest in a folding dining table to create plenty of space.
Bright colors create a feeling of greater space. Grey, beige, and pastel colors are perfect for creating a bright but cozy feeling in your apartment.
By building storage at height, you make it possible to utilize the storage options to the max. When you live small, it can be good to use closed storage, such as a chest of drawers instead of open shelves. Then you create a tidier feeling in your apartment.
Mirrors make the room feel bigger than it is. Mirrors in the hall are a common decoration, by also placing mirrors at the dining table, bed, or sofa to make the room feel bigger.
Invest in getting good and natural lighting in your apartment. Use several light sources instead of one large one. Then you increase the light in the apartment, which creates a feeling of more space. By investing in thin curtains, you also get better light in your apartment.