Nice airport has 2 terminals : international flights are usually located in Terminal 1 while Terminal 2 is mainly used both for domestic flights and also for EasyJet company’s flights.
The airport is located very close to Nice ; the urban bus network therefore provide a direct connection between airport Terminal 1 and downtown.
Visit Nice’s airport website:
Alternatively, you also can take bus # 23, get off at anyone of these bus stops: "Magnan", "Rosa/Bonheur", or "Grosso CUM" ; then take either bus # 3 or # 9 or # 10 and get off at bus stop "Médecin/Pastorelli", and then take the tramway on the ’avenue Jean-Médecin (the rest is same as above).
For bus network map and schedules, go to the website of the company Ligne d’Azur :