I rent a flat (some week-end or holidays - 2 bedrooms with matrimonial bed) : it is like a house on the roof with terraces and balconies, very comfortable and quiet in the aera of Longchamp, 5 mn by foot from TGV station gare St Charles, subway, tramway, buses, bike and car-sharing stations. Easy to park in the street. Free internet wifi in the flat.
You will enjoy the town as well as the sea and the Provence.
Look at the photos and feel free to ask for details.