Tallinn works for a northern Estonia circuit. If starting with the old town, compare collecting only after the city stay.
The airport locates rental offices in the public transport terminal. Follow signs and your booked operator’s instructions to that area; check the separate vehicle pickup and return directions.
A rental helps reach national-park accommodation, rural stops and Saaremaa. Tallinn old-town days can be arranged before collecting. For an island-only stay, compare flying to Kuressaare with carrying a mainland rental on a ferry.
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.