Oulu is a regional option for the Gulf of Bothnia coast. Check the distance to your actual first base before booking.
Use Finavia’s airport-specific rental list and agree the collection time directly with the booked branch. Check the vehicle return location and key-drop rules separately.
A car is useful for rural lake accommodation, national-park approaches and independent travel beyond the main train routes. Helsinki city days often work better before collection. Lapland is a separate regional choice, especially in winter.
Compare airport collection with a later collection if you start with a city stay. Include the transport to a different rental branch and any extra parking nights when comparing the total cost.