It isn't Port Isaac on the north coast, but Porthleven on the south coast; the two are very different but both are small and charming. The church at the entrance to the harbour and the roadsign "Institute Hill" clearly identify the location. Charlie
The part of Cornwall used in 1994 for Episode 1, Season 1, is Port Isaac, the same locale used, starting in 2004, as Port Wen for "Doc Martin," and the actual site of the fishing village in the 2019 film, "Fishermen's Friends."