“I have no clue how they got this idea,” Solanki recalled. Still, she and Colin delivered, scrounging up an invite to a friend of a friend’s Halloween festivities. The evening went smoothly; now Solanki and Colin occasionally offer a soirée appart add-on. The latest person to take them up on the idea was Eden Brill, a marketing manager and psychology student from Zurich. On a Saturday night, she sat with a glass of champagne in the garden of the Saint James Paris hotel, in the Sixteenth Arrondissement, where Solanki and Colin had suggested that she stop before the main event. “They floated the idea and I was down,” Brill said.journey-inline-newsletterinline-newsletter