When you list your property, there are some useful hints on 'Selling a French Property on Sifex Boutique' in the 'Sifex Boutique Guides' box on the home page.
When adding a property, most of the form is self explanatory.
The three property categories are: Chateaux for Chateaux and Castles, Fine Properties for historic properties e.g.Manoirs or Gentilhommieres, Maison de Maitre and All Properties, encompassing every listing on the site, including those properties which don't fit into the other categories.
Commercial:to mark your property as 'Commercial' use the tick box.
The Length of the Title field and the Resumée are restricted for display purposes.
In addition it is worth mentioning that the form only allows you to enter land in Hectares. 10,000m2 is one hectare. You can put 0.5 for half a hectare for example.
For images the site requires that they do not exceed 2 MB. The optimum size is 900 x 600 pixels at 72dpi