I've seen this idea before, and it does look like it would solve the problem nicely.
Hard to lug around a mattress when you're moving house (if you're renting), though.
Hard to lug around a mattress when you're moving house (if you're renting), though.
Are you in the US, or somewhere else?
Access to many apartments and houses in London is very restricted. You'd have to take your furniture apart to get it through the door and up the staircases.
That said, a mattress will fold and bend round corners easily, so I don't think this is a big issue if you're renting. (Getting rid of the landlord-provided mattress may be a bigger problem in my experience)