Joomla estate agency component has had the ability to use the title alias in the url since the last major update.
The currently available plugin for xmap still uses the old url structure which just uses the property id.
I noticed this when checking on a site made a couple of years ago which has been fully indexed with the old url structure.
I have uploaded a new version, which, together with the canonical url fix mentioned in the last post could bump up your property site's listings.
The new plugin is here.