If you are coming from the north with your car, the best solution is to follow the highway from Villach to Ljubljana continuing to border crossing Kaštel-Dragonja and then to Rovinj. Use the direction Trst Kopar - Rovinj if you are coming from the west. If you are coming from the east you can reach Rovinj from Zagreb - Rijeka - knot Kanfanar - Rovinj.
International airport of Pula is 40 km apart from Rovinj and is connected with bigger European destinations. Some smaller sport airports are located nearby Rovinj.
The rail station is located 18 km apart fro Rovinj (The Rail station Kanfanar) and the bus station is located in the downtown of Rovinj. It is well connected with the most of the big centers. If you need a ride to your hotel, apartment, house or villa, you can use the local transportation or a rent-a-car.
You can reach Rovinj through the sea. One of the options of arriving by the sea is traveling with the ferry. Rovinj is also connected with Venice, Ravenna, Pesara and Cesenatico by the sea.
So, if you have booked an apartment, house or a villa in Rovinj, you can reach your destination in different ways, depending on your wishes and possibilities.