Airtasker can be great like that - I did the same thing to get rid of a wine fridge that Marketplace buyers kept not showing up for. I’ve had a bit of weeding and gutter cleaning done via Airtasker too.

Narrow staircases can be an issue, but movers can be pretty clever with stuff like that. I used to live in a flat above a shop which had an external spiral staircase up to a narrow landing to the door, the movers managed to get a neighbour’s double bed up the side of the shop below and lift it over the landing from the shop roof.