Ye OK beds in general were no luxury. But:

"The webbed bases of the beds were made of ropes"

Does not sound like cheap 79 AD bed to me.

That's how all beds were made prior to the advent of box springs (or modern mattresses, which don't require a separate box spring). Very old beds still have the hooks necessary to hold up the ropes that supported the mattress.

I've seen medieval beds in the UK that were a wooden 'tray' (on legs, or built into a wall) and the guides said a hessian bag was filled with straw (dried stems of wheat/corn/barley; straw and hay are often used interchangeably though, so it might have been dried wild grasses) for bedding.

I assumed poor people slept on the floor with whatever coverings they could muster. Suspended beds seem very decadent.

The stretched fabric, like canvas, over a rectangular frame design seems pretty common and would have surely been a more natural early bed. Similarly hammocks - which I thought were common on ships (at least in the later middle ages).

Guess I've discovered I'd like to read a history of beds!

Not wooden slats with straw mattress?

Why not? Was rope particularly expensive?

It takes a long time to make by hand!