Promenade des Anglais, straight on, turn left before the Hotel Negresco into street Cronstadt, go straight on, 2nd on your right = Maréchal Joffre, take next on your right = Rue de Rivoli.
Cross the street, go into rue Berlioz always straight on = 10 min. walk
Shuttle bus from the airport :
Please, take the bus nr. 98 (terminal I and terminal II) in direction of city center,
Go of stop: Gambetta, than walk along the Promenade des Anglais to the hotel Negresco,
Beside the main entrance the rue de Rivoli starts: straight on, around 100 m, on your right: Pavillon de Rivoli, Nr. 10 rue de Rivoli.
You can by the ticket in the bus (around 4 €) the driver has change.