$20 · Queen mattress and boxspring

My tenant says the mattress is a bit soft in the middle. I lay on it and I thought it was a medium firm mattress. She put a blanket in the middle on top to make it even. Maybe if you put something under the mattress in the middle, it would be better. Anyways, its cheaper than a new mattress if you want it. Its a Simmons. I got a double to replace it, that's why I am getting rid of the box spring too.