I don't know what time your flight will arrive Nice, but it will cost you around Euro 30-35 to get to the HI in city center at Victor Hugo at night by TAXI, and the early morning taxi fare will be about the same, so the round trip will cost you like around Euro 70. If you arrive early during the day, I would suggest the HI in city center since you can tour around the town and even travel to Monaco since the train station Nice Ville is only a short 15 mins walk from HI Victor Hugo, and it will take half an hour to get to Monaco from Nice Ville by train.

If you like seaview room, HI resort is for you, and there are bunch of restaurants at the waterfront.