At the door
If the layout allows, you can installunit by the door. This will work if there is a convenient corner or a flat wall near it. If you have the opportunity to order furniture from a craftsman, you will always be able to choose the optimal dimensions for your room.
Under the work surface
If the family consists of 2-3 people, thenthere is no need to buy a large refrigerator. Choose a low model of about 50 cm. It can be hidden under the countertop, which will save space.
Not in the kitchen
If you want to buy a full-fledged model, butthere is not enough space - consider installing it in another room. For example, a storage room, an adjoining room or even on a balcony, if it is glazed. But then you should consider the style of the room where it will be located.