Distance and sorting
The distance filter and the nearest sort appear only after you choose a place from the suggestions. Without a centre point there is nothing to measure from.
Distance is measured from the listing's public point, which is snapped to a grid of about 300 metres. Treat it as an estimate, not an exact measurement.
The other sorts are newest, price low to high and price high to low. The default is newest.
Sorting by price compares prices in one unit, so spaces with no price in that unit are already not in the list being sorted.