Thanks for visiting! TONMO is the world's greatest online cephalopod enthusiast community, with interactive content going back to May of 2000, and a biennial conference. If you'd like to join in on the fun, become a TONMO member -- it's easy and free. You can follow us on Facebook and Twitter for more cephy goodness.
You can almost see a star around the eye and the speckled look is a common coloration for A. aculeatus so, with the given location, I would be pretty comfortable with this guess. It is hard to guess size though and I did get one that was nocturnal and quite small with a similar appearance.