On the  right-handside of foyer is the staircase and double doors to the dining room. Under the stairs is a door to the kitchen. There are matching double doors to an unknown area, on the opposite wall.  Entry to the living room is directly oppossite the front door.

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 View of the entry foyer from the front door looking into the living room.
The staircase is on the right.

View of the foyer from the top of the staircase.

View of the foyer from the living room - looking to the front door.

Jonathan and the detective walk through the front door to stand at the entry to the living room. The Hart's bedroom through the doors to the right of the upstairs banister.

Left side of the front door - from the living room into the foyer

In the above photos the Harts walk their guests from the living room to the front door.
The double doors  behind Jonathan were, always shut and I do not know where they lead. 

Door to the kitchen from the foyer  

  View of the door under the stairs that lead to the kitchen 

The dining room

 The double doors  to the dining room are on the right as you walk through the front door. 

Dining room layout.

[Thanks to Brian for the dining room photos] 
The dining room is only used for formal occasions and is a magnificent room. 
It is lined with paneled dark wood,  and splashes of pink can be seen in the curtains on the windows to the right of the mantel, and shelves to each side of the fireplace.

The door on the left hand side of the room  leads to the kitchen.
As you look to the right you will see the fireplace and mantel on the back wall. 

A  large  table sits in the centre of the room, one end facing the fireplace, the other the doors that lead to the entry foyer. 

  Two large windows, separated by a cabinet are on the right hand side of the room.
Above the cabinet sits what looks to be a Venetian glass mirror, below it is a large vase of flowers. You can see the doors that lead to the entry foyer  just past the windows.

 View of the display shelves on each side of  the fireplace. 

 The last photo details the mantel - note the candelabras and metal plate display which matches that which can sometimes be seen on the kitchen mantel.