Price Controls: Generally a bad idea that often harms the people they are intended to help and mainly served to protect incumbents. (e.g. Rent control) A better solution as Torie and I have discussed, is that if the poor are unable to afford X, then we should give them the buying power to afford X. So in the case of high rents, the solution is not rent control, but rather vouchers, subsidies and more public housing.
I guess this is generally something easy to agree on, but I'm curious what exactly is X, and since it's the point of the thread, I assume there are pretty generous adjustments based on family size without giving too much inventive.