Dear client,
Here is a simple design to suit your requirements.

A dining table for twelve would take up most of the area in the living room. Hence, it has been broken up into multiple smaller convertible units which can be joined to the main dining table when needed. This gives multiple options of arrangement according to number of guests.

White translucent curtains of full length seem to accent the classical fireplace elegantly. They also act as divisions between the living room - guest room - kitchen. The wine cellar is also discreetly hidden by the curtains. A textured / wallpapered wall opposite the fireplace ties up the living space and gives a pleasing background for photo-frames / artwork.

The upper floor bedroom has been re-organised according to the height available - placing sitting and storage functions at the end with lower height. The other end, due to presence of the window, has been left devoid of furniture to allow maximum penetration and reflection of light.