Hopefully you have EXACT location of Cristina (likely the spelling of her first name) and not the approximate location unless she works at a store with a name you recall. Otherwise, if you have the location of her residence you'll also need the name of the person whose name is on the CALL PANEL at the door. QUITE often, no names are listed on those portal CALL/RINGER PANELS, just the numbers of the flats.
I wish you the best of luck! Saludos, MadridMan
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