First thing you need is a pad of graph paper to understand that there is no way the furniture items are to scale (exception could be the dining table) I'm guessing the kitchen is off to the left and the main entry is into the Drawing room? Can the wall be eliminated between the two spaces for more flexibility? - if so, the drawing room space would lend itself perfectly to a round dining table. But the main thing is to draw on graph paper the space & actual dimensions of the furniture you'll be bringing to your new home - so you are not shocked when you move in.

There are discrepancies between the two plans you have provided, so it is difficult to understand what has been built and what is proposed. That being said, the powder room will have more of an impact on the garage space than you are indicating, and think that will have negative impacts on the garage which you will want to avoid. The location by the dining room and stairs will also require significant changes to the plan in that area (powder room is still represented too small). The powder room adjacent to the pantry seems like a great place to put it, or in the ancillary seating space to the right of the main living seating. That seating area does not seem to have a great functional importance except to have the dining/living/side living space extend across the whole house, unless there is something happening that isn't apparent from the plan view alone.

i used the 3 +1+1 because it allows for more flexibility for moving around the room i suggest that an L shaped sofa would block access to the sliding door and/or the front entry, perhaps 2 x 2 seaters could also work and/or you could try swopping the lounge and dining areas but that arrangement doesn't allow wall space for a TV

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