Hi,
Properazzi is certainly an interesting and very brave proposal, it is important to know though that properties don’t actually reside in their database, just a brief listing / description and photo which link through to the full property details on your website or portal where your properties are found, to appear on Properazzi you must have a platform where your properties are already visible.
In reality and in contrary to what is said above Properazzi is very unlike Kyero, the idea is similar to that of google / googlebase, trulia and other vertical search engines. Properazzi have robots trawling the net which pick up information directly from websites and xml feeds and this is then listed on their site.
If you want a free platform to showcase your properties, which is starting to do well in a very broad range of google searches (town and villages) and which can provide an export compatible with the mentioned Properazzi (and other portals) then try the free for all
TheBigMover.com.
Cheers ; )