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Multiple realities
(covers information from several alternate timelines)

The pool table in Chez Sandríne

Chez Sandríne sign on the holodeck

Chez Sandríne as it appeared in the holographic program Paris 3

Chez Sandríne, also known as Sandríne's bar, was a small wharf-side restaurant annex bar in Marseille that was established in the 18th century.

When Tom Paris was studying at Starfleet Academy, he was a regular visitor at this establishment. Most of his time there was spent at the pool table. During his time on the USS Voyager he created a holographic version of his favorite hangout for use on the holodeck. The holodeck program was saved under the file name Paris 3 and was used on a regular basis by the ship's personnel. (VOY: "The Cloud") Guests trying their hand at pool found that the table rolled a little to the east. (VOY: "Jetrel")

According to The Doctor, "Ensign Paris whiled away a good portion of his academy years here, no doubt to the detriment of his scholastic performance." (VOY: "Someone to Watch Over Me")

In an alternate timeline, Paris spent most of his time at Chez Sandríne after having been left behind on Deep Space 9 after getting into a fight with Quark and getting arrested by Odo. (VOY: "Non Sequitur")

The conceptualization of Chez Sandrine was inspired by the recurring social environment of poker in Star Trek: The Next Generation. Brannon Braga stated, "We […] wanted to create our version of the Enterprise's poker table. We thought pool might be fun, so we created an old Marseilles pool hall, and ended up using it quite a bit." (The Official Star Trek: Voyager Magazine issue 5, p. 48)
Due to its repeated reuse, Chez Sandrine was built as a standing set, on Paramount Stage 16. (A Vision of the Future - Star Trek: Voyager) For its recreation in "Someone to Watch Over Me", the set was built on Paramount Stage 9, as noted on the call sheets.
While the call sheets of the episode "The Cloud" referred to this location as "Pool Hall", the call sheets for "Jetrel" named it "Marseilles Bar". All subsequent call sheets named the location "Sandrine's Bar".