Guys, sorry to chime in, but I've some experience here too.
I originally applied for Erbil too. I got an email about English language teachers there and applied alongside Bahrain. My family weren't happy but I was adamant that Iraq/Erbil was safe. The woman who interviewed me did so holding a baby and several times the internet failed. It didn't speak wonders about the place to be honest. Eventually in the second interview it was just audio. I mean surely the school must have good internet right?... She was also making sure I knew about the "situation" there, which I was surprised she brought up since I though it was "supposed to be safe". Also, accommodation there is 40mins driving from the school, so you're going to have really frickin' long days there.
Lastly, I still wasn't sure I made the right choice in coming to Bahrain, but I've met several teachers here from Iraq... they were all absolutely SHOCKED when I told them I originally wanted to go to Erbil. They insisted that it just was not safe, despite my intention to stay in Erbil.
That's all I know, hand to heart about Sabis in Erbil. Take from it what you will
Oh and I'm sure that most of the kids in Sabis Erbil are most likely locals (since most expats wouldn't want to travel there), behavior (my hunch) is probably disgustingly bad. But they do pay a little more there I think!