Nice. I picked one of these up last year. Mine is the same color as yours but your bike looks to be in better shape. IMHO, it looks to be in extremely nice shape. It doesn't look like it needs to be restored at all. The decals seem to have held up really well. In general, these old Gitanes had pretty lousy paint and the decals didn't hold up too well.
Mine is far from original. The derailleurs, crankset, brake calipers and levers had been replaced on my bike. The guy I bought it from had used it for time trials and had replaced the front wheel with a newer Mavic. The rear is what looks to be a period correct Mavic with a Campy Gran Sport hub. He also gave me a matching front wheel. Mine is too small for me and I might give it to my dad.
Hot, soapy water does a fine job for cleaning the bike. There are numerous chrome cleaners/polishers on the market. A search here in the CV forum will turn up a lot on how to best clean chrome.
Joe C