Hello Ariosto!

It depends a bit on what version of the program you are interested in. If you like WebSite X5, you will be able to use the following webhosting service http://www.websitex5.com/it/webhosting-evolution-10.html if you prefer the WebSite X5 Professional 10 instead, you can use this http://www.websitex5.com/it/webhosting-professional-10.html After one year free, you will have to renew the service if you are interested in it. It will cost you 30€ more or less. You will find all the information you need about the webhosting service in the ages I have liked above. 
I hope this helps,

Samantha