I think all the Scions have inns where they can have -a- room reserved for them, but I think Tataru is the only one who could have a specific room permanently reserved under her name. Given how Tataru has been described when gathering information, I'm pretty sure any inn rooms she has reserved are the ones that make you glad that no one in Eorzea has yet to invent the blacklight. In her defense though, her "measures" do indeed yield results.
When we get to Old Sharlayan, I'd wager that the central hub would be the Leveilleur estate because of how much money the twins are sitting on.