In a house with small spaces, less is more. A house with minimalist decoration can also be very sophisticated. The more furniture and decorative objects you put inside a room, the smaller it will look. So small houses should think about simple and practical stuff and avoid many merely decorative objects. A light-coloured wall with not many poster frames, or a cleaner countertop can be good tricks for tiny houses.
Replacing some walls of the house with glass , or adding walls with mirrors can significantly enlarge the space.
In a small house, everything has to be thought out in a practical way. So, opt for beds and stairs with drawers, for example, benches with cupboards, even chairs can serve as wardrobes. Nowadays there is a bunch of functional furniture options.
Covering different rooms of the apartment with the same material on the floor gives the impression of a larger space, because it eliminates the delimitation of spaces.
Using shelves and countertops it is possible to separate the space in a smart and functional way, without reducing it.