You need to add the below CSS in Theme Options-Design-Custom Colors- Custom CSS

[for="property_price_per_week"] {
display: none;
}
[id="property_price_per_week"] {
display: none;
}
[for="property_price_per_month"] {
display: none;
}
[id="property_price_per_month"] {
display: none;
}

The ” might need to be replaced manually in the CSS.