What a quote covers
The price a pro bids is the whole job: the labor to carry it out, the truck, the fuel, and the landfill or recycling fee at the other end. You are not quoted for the item — you are quoted for the space it takes and the work to move it.
That is why access matters more than weight. Stairs, a long carry from the back yard, a sectional that has to come apart, no elevator in the building — each of those adds time, and time is what you are paying for. Say so when you post and the bids come back accurate instead of getting revised on the day.
What nobody can legally take
Paint, motor oil, solvents, pesticides, asbestos and medical waste are hazardous waste. No junk removal company can put them in a normal truck, and a company that says it will is one to avoid. Your city almost certainly runs a household hazardous waste drop-off — that is the route.
Tires, car batteries and propane tanks sit in between: some pros take them for an extra fee, some will not. Ask before you book rather than on the day.
Where it ends up
Anything still usable should be donated before it is dumped, and most metal is worth money at a scrap yard rather than nothing at a landfill.
4 states — California, Connecticut, Oregon and Rhode Island — run mattress recycling programs you already paid into when you bought the mattress, so recycling the old one costs nothing extra.