Be arriving there tomorrow for a week or so. Any good suggestions?
For espresso or coffee?

Santiago, Chile is now famed for their "café con piernas" (café with legs). But this is only served for boys because literally, café con piernas is served by service staffs consist of females dressed in clothing considered to be revealing like miniskirts and short pants which shows their legs. But, Santiago offers good espresso like espresso with water, courtado and Nescafé too.
You should try them, Santiago's got nice coffee shops there.