Follow the advice of Nicolas75. I lived there for a year while my wife was teaching at a local lycee. It really is a marvelous city that is very much misunderstood. Do see Notre Dame de La Garde, the cathedral that overlooks the entire city and has a striking view of the city. The city bus will get you there quite cheaply and operates every 20-30 minutes. The Palais Longchamps should not be missed for its grandiosity. There are scores of excellent restaurants, particularly in the waterfront area. If you are looking for modest accommodations, try the Hotel Fereol built on a pedestrian walkway in the old city. There is also a two line metro system which should be experienced.