House plot class rank?

[Demeos]

Really? the difference from a first class to fifth class is just the location of the house itself, not the size of the garden and stuff like that?

Taken directly from the patch notes:

The number of outdoor furnishings that can be placed is dependent on plot size:
-Small: 20
-Medium: 30
-Large: 40

* Once a furnishing has been placed, it can no longer be traded or sold on the market. Furthermore, certain furnishings will be lost upon removal.

Also:

The number of interior furnishings that can be placed is dependent on estate hall size:
-Cottage: 50
-House: 150
-Mansion: 200

* Once a furnishing has been placed, it can no longer be traded or sold on the market. Furthermore, certain furnishings will be lost upon removal.

Source: (link)