I hear it has quite a good reputation among coffee connoisseurs.
Literal
Coffee-connoisseur [gen-の] people [among-に] fairly reputation [subj-が] good [hearsay-そうです].
~通 'connoisseur / expert / enthusiast' is a productive suffix — コーヒー通 'coffee connoisseur,' 映画通 'film buff,' etc. 結構 'fairly / quite' marks a positive but moderate degree. ~そうです (hearsay) — 'I hear that' — reports information received from others, distinct from the conjecture ~そう attached to adjective stems.