There was no huge reason to pick Falmouth for one of our weeks, except that Susanne said she's always wanted to go, and as she's the native, we assume it will be a nicely situated base, a concept I learned from my mother, who is British and spent decades being a tourist in her own country. A base is a spot that has good transportation: giving you bus access to all the outlying places you plan to explore. In our case, I assume we'll be hiking the coast path going both directions, leaving Falmouth in the middle and making bus service fairly easy and thereby meeting necessary amenity#1. But equally important is necessary amenity#2: Marks & Spencer, which Falmouth has.
That's all we require, really.
The fact that there is a decent High Street—according to Google maps street view— and several fish & chips and other restaurants, and most likely cream teas and plenty of pubs, and probably some cool history thing or two or ten, makes Falmouth a no-brainer.
Pull up on the map and you'll see that the coast path goes right down (and up) Market Street, which looks like a main drag. Over the course of its rambling 630 miles, the South West Coast Path takes you to some of the remotest corners in the UK, and also through town squares, up cliffs, across beaches, through sand dunes, across yards, and —we'll experience this September—up Falmouth's Market Street.