Sparebnb explores the personal stories of the guests and their short term stays at the flat of the mysterious Gavin.

This is a handful of what ifs and who ifs, of people and slices of their lives while they stay in a Sparebnb flat, and how this flat influences their stories; stories about parenting, early days relationships, and even a porno with a Mike Leigh-style twist.

We never see Gavin. Each episode focuses on a different set of guests.