As well as being a storage space for my tools, unused furniture, suitcases, half-empty paint tins and a barbecue, it also house all my records, and two turntables to play them on. And four big speakers. If it wasn't so full of junk, I could have an excellent party in there.
A couple of years ago myself and a friend insulated and plaster-boarded the interior, so it's surprisingly cosy in there.