How does it work?
You can't decide which holiday rental you like best? Instead of searching again for the same property, you can add your favourite listings to the category "My Vacation-Apartments".
And this is how it works: if you like a rental, click on the grey heart that is to be found on the top right of each listing. If the accommodation doesn't please you any more, you can delete the listing from your favourites by clicking on the heart again.