I’ve got a mate with a gite in Brittany that sleeps 8 easily, it’s 2km fron 12 x organised trails, 10km from Plouay (massive cycling town, velodrome, museums etc), about 40 miunute drive from the beach.
website here
French Brittany VTT (MTB) website.
I’ll dig a map of the area out.
He asks about £475 per week (£60 per person based on 8), and the ferry is about the same again high season.
Cracking place – stayed there for two weeks last year.