I disagree about putting the cafe in the top left corner. I think near the center of your town would be nice if there's room, to the top right of your plaza and by the horizontal bridge. I can just imagine a path running horizontally and having the cafe there and surrounding it with perfect fruit trees. It depends on if there's enough room.
And I would put the police station to the left of your train station, as close to the train tracks and bulletin board as you can.
I totally agree putting the police station next to the town hall. I would did that in my town but Marshall moved in next to it so i put it next to the plaza. yeah and the cafe would look so cute next to the plazaI like the idea of putting the police station by town hall
and the cafe would be cute near your plaza, since you have a lot of houses down there, its easy for all the villagers to get to for a hangout spot