The models were created using the Subdivision Surface Modifier. You can alter the number of polygons on the model by altering the values on the modifier menu. 

Each Couch is grouped. To move and position a whole couch simply select one of the objects of the couch and press Shift + G > 'Group'.

Image shaders included:

Wood_Texture.jpg (2400X1600 pixels)  

Canvas_Texture.jpg (848X821 pixels) - Used for the couch fabric.