One of my big concerns when I got my bengal kittens was them biting wires. And sure enough, this turned out to be a problem. So what ended up working as a deterrent, was a combination of wire covers and bitter yuck (spray).
Another problem was that once they got acclimated and had the run of the house, it was real difficult to keep track of them! Some people will disagree, but I found a breakaway collar (very important for it to be the breakaway kind) with a bell on it was a godsend.
I kind of went overboard, putting child-proof locks on the cabinets where there was stuff that was either potentially dangerous (household cleaners etc) or stuff I just didn't want them to get into (food, baking supplies etc). Turns out neither of them had any interest in cupboard, and still don't!
Then just other common sense stuff, like keeping toilet lids closed, windows closed, doing a "cat check" before leaving the apt or immediately after entering the apt.
Also anytime you are doing a load of clothing or running the dishwasher, or using the stove, those are other times where you need to do a "cat check".
Plants are another thing you have to worry about. Indoor plants can be great for cats, provided you get the right ones. There's a good list here of the do's and don'ts of getting plants:
http://www.aspca.org/pet-care/animal-po ... xic-plantsAlthough this might be overly North American specific. Maybe there is a similar list for the flora around where you live.
Also, you have to kind of enter a room, and look *up*. Those are the places the cats are going to attempt to get to, lol. Bookshelves, counter tops, tall pieces of furniture etc. So you need to make sure anything left on those surfaces is either clamped down or is something you don't really care if a cat attempts to bat off and onto the floor.
One other gotcha are things like televisions and computer monitors. Yep, cats like to jump up on top of those too (with potentially disasterous results). So make sure they are placed in such a way that they either can't be jumped up on, or are fastened down such that if they do, it won't come crashing down.