For this I’d say a good friend; not a casual acquaintance but nor a partner or family member or best friend who you might more readily supply a blanket ‘yes’ to
Notably thinking of when I offered to move a ‘few bits’ of a friends stuff from halls after they’d gone back home. Was 5 car loads of stuff including a huge box of toilet rolls. Had to store that in my own fucking house
So really it’s a question of authenticity and integrity because I’d sooner the suspense of delaying to say yes than the fraudulence of saying yes knowing full well I might not do it