Asking whether a Hyundai Kona 1.Generation Elektro (39 is a good family car, is not easy to answer from a technical point of view. The range of families requirements is wide, so this consideration only considers the common aspects.
The Hyundai Kona brings 5 seats with it which is basically good and sufficient for many families, but the car fluffs when it comes to the trunk - 1114 liters of volume might not be sufficient for most families. There are no Isofix brackets installed. These could be used to secure child seats easily and safely.
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