I was there in Sept., and just had a couple comments on two of your questions:
1. I found the safe easily large enough for my laptop and other electronics. It probably would have fit the housing for my compact camera and my Inon strobes, but to be honest I never had concerns about theft, even if I had been on 1st floor. Den Laman didn't seem like a place that thieves would think was an easy target.
3. It's not prohibited to bring items to your balcony for drying, but IIRC there is a sign requesting that sand and water not be tracked through the hallways, so if you are carrying wet gear in a mesh bag, it might be a good idea to place a beach towel at the bottom of the bag to keep it from dripping. I found it helpful to bring along a few sturdy plastic clothes hangers for rash guards, wet suits etc. as I don't recall many extra hangers in my unit.
They do a good job of providing bath towels, washcloths, TP etc., but kleenex and paper towels/napkins are the responsibility of the renter.
The Dive Friends retail shop in the strip mall across the roundabout sells beer! (But it's cheaper at the market to the north.)