The front of the card shows the fairly typical scene of Nice, with well-dressed people out for a stroll.
There's also the woman (?) on the left-hand side of the card with the umbrella.
And then there's the kiosk, selling magazines and newspapers from all over the world.
And finally, there's the back of the card. The message is written in Russian, so I can't begin to decipher it, but it is addressed to Mr. Narischkine at Palazzo Galitzine in Rome. Who is this Mr. Narischkine and what is Palazzo Galitzine?
I found a reference in the New York Times, February, 1918 referring to a Prince Cyril Narischkine and his marriage to opera star Genevieve Vix. This doesn't guarantee that our postcard recipient is Cyril Narishkine, but the address of the card at Palazzo Galitzine in Rome is another clue. The Galitzine (Golitsyn) family was also a noble family of Russia with hereditary connections to the Narishkine family. It's also possible that our recipient was M.B. Narischkine, who liquidated an extensive art collection in 1883. That's where that Russian translation might help.