Chez Sandrine was a holodeck programme written by Tom Paris, recreating a smoky waterfront bar in Marseilles that became the Voyager crew's favourite off-duty haunt in their first years in the Delta Quadrant.
Paris based the programme on a real establishment he frequented while at Starfleet Academy. He introduces it to Harry Kim in The Cloud, complete with the flirtatious owner Sandrine, the pool hustler Gaunt Gary and a pool table that soon draws in Janeway herself.
The bar features in many early episodes, including Jetrel, Twisted, Meld and Lifesigns, in which the Doctor brings the Vidiian physician Danara Pel there. It serves as the ship's unofficial social club, the setting for birthday parties, betting pools and quiet conversations.
From the third season the crew turn increasingly to other programmes, such as Neelix's Paxau Resort, and Sandrine's fades from view.