Hi Paolo…
To change the title, you should be able to just modify the report title property. For my needs… I also do not want to display the default “report viewer” title… so what I wound up doing is replacing the title text with ” “. If you simply clear out the title value, it will still display the default “report viewer” title… so I replace it with a non-breaking space.
As for not displaying the report viewer toolbar… try calling the report viewer in preview instead of frameset mode.