u/whateverrrrrrr18

Me and my friend are moving into a new flat, and we asked for new mattresses, but one of the ones the landlord provided is obviously not new and has stains on it, and the other one is brand new but very uncomfortable.

Would it be reasonable for us to just buy new mattresses and throw away the current ones without informing the landlord as long as we just leave them behind when we leave the flat? We know it's our loss of money, but we don't want to get into an uncomfortable situation with the landlord. Also, we are worried that even if we demand for the new ones, they won't be any better