Hi Malteaser!
This may not be so much an apartment issue as a Bridgeport issue. I'm sure I've seen something about this elsewhere in the forum.
I haven't played an apartment in Bridgeport (I don't like them in real life, so I head for the hill with the houses). My first test game in a new expansion is often one of the ready-made ones, and for Bridgeport I played the Striker family, Richie, Stella, and toddler Sebastian. I actually got hooked on that family, rebuilt their house and poured a lot of time into it.
Right from the start I noticed that when interacting with the toddler the parents would start to walk toward him, then abruptly pull a U turn. After a stroll around the yard, they'd either do something else, or walk back to him. By then the toddler would be doing something else, parents stomp feet, and drop the action. I had to put the game in pause, cancel all of their actions, start it again until the kid pulled himself away from the toy, pause again, and line up their actions again. It took forever to do anything that way.
I also developed disappearing butler issues. Then they got the bug where they got stuck in bed, and I was constantly resetting them, and by that I mean every ten minutes or so in real time. I did every fix I saw here for all of it, and none of it solved the problems. So I stopped playing them, and tried another game in Bridgeport, without a child, to avoid the frustration. Their butler kept taking off too, and a firefighter got stuck in their house (finally got rid of her), then they started to get stuck in bed too.
So I quit playing Bridgeport. I'm hoping for a patch someday that will make it playable for me. I've fled the city for sweet rural Riverview, as I'd never really played it much, and I can't handle the pressures of Bridgeport city life.