In determining for the purposes of this Act whether a house is unfit for human habitation, regard shall be had to its condition in respect of the following matters—
repair,
stability,
freedom from damp,
internal arrangement,
natural lighting,
ventilation,
water supply,
drainage and sanitary conveniences,
facilities for preparation and cooking of food and for the disposal of waste water;
and the house shall be regarded as unfit for human habitation if, and only if, it is so far defective in one or more of those matters that it is not reasonably suitable for occupation in that condition.