I know there is one apartment in the Arts District that has the mouse hole object that generates the mice. It's a one bedroom and the whole apartment is sort of run down. I believe there is another one in one of the other zones that's sort of like that too but can't recall which one it is atm. In addition to the mouse holes, those apartments also have the exposed electric boxes that short out from time to time and they also have roaches. Most of the other apartments in San Myshuno don't have any of those objects. So the simplest fix for your issue is to move your sims to another apartment that doesn't have those things and you'll have no mice or roaches and no electrical outages either.
Hope this helps.
