The Santos house features three different staircases in three different episodes.
In the season 6 episode "Impact Winter", the staircase inside the front door to the house can be seen leading away from the door to the left of the hall.
In season 7, in the episode "Running Mates", the staircase can be seen coming down from left to right behind the door in a number of scenes,
Later in season 7, in the two "Election Day" episodes, the staircase has changed yet again, now curving upwards from the right of the door. Either Helen Santos has been doing some extensive remodelling, or different sets were used in each episode.