SKY: Your apartment is on the street side, so you don't need to walk anywhere, only upstairs to the door.
SUN: Your apartment is on the 1 floor, so you don't need to walk anywhere. Your door in on the rightest side, on the street side.
ROSE: Your apartment is on the other side. So you should walk a little bit down. There are 3 doors. Yours is on the leftest side (first one on the left).
IRIS: Your apartment is on the other side. So you should walk a little bit down. There are 3 doors. Yours is the middle (second one).
LILY: Your apartment is on the other side. So you should walk a little bit down. There are 3 doors. Yours is on the right side (first one on the right).