Sorry, but upon quick glance at the SFML2 view functions, I can only see the Zoom() function for setting a zoom factor relative to the current one, but no SetZoom() function for setting an absolute one. Did I miss something or is it really not there?
For position change, Move() for relative change and SetPosition() for absolute change seems to work fine for example.
Also I noticed that I have to call "App.SetView(View);" after each change to zoom or position change of a view, else the view won't adapt to the changes. In the tutorial on this site for views it is mentioned that changes will be applied automatically? No big deal though, as I have to change/switch the view anyway several times during a frame update.