After searching a bit on the net it seems that I can't map CtrlSpace to anything/alot. Is there a way to do it today, what I found was usually 2 years old.
I've run into the same issue, the short answer is yes you can, and not only in the gui version. Adding this on you .vimrc is enough:
.vimrc
inoremap <C-Space> <C-x><C-o> inoremap <C-@> <C-Space>
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