Wow, this is crazy. I've been working on and off on a similar site for a few weeks now.
Most of the features are done. Just need to finish up, clean up code and release.
I was in the same boat are you Maurycy. It's crazy how identical our ideas on website full of ideas is (if that makes any sense!)
http://idealarm.com/comp/ (Just a mockup of the look, no real code).