As you progress the Main questline, you get your own house!
Once you have your house, touch the house icon located next to the minimap on your screen to access your house.
You can decorate your house with wallpapers, carpets, furniture and sculptors. You may even receive different benefits from the items you placed!
For example, placing a Storage Box allows you to store items in it, while placing a sculpture gives you special buffs.
Talk to an Architect NPC within a residential district to purchase a bigger house or move to the district.