I am referring to knobs on my doors. Cabinets are bronze downstairs and nickel upstairs. I don't want to have to change doorknobs to sell, which might be in a year or two. So, is it weird to do nickel upstairs and bronze down? Or is is better to do the whole house the same?

I would choose a grey sofa, but really any colour would look great, tan leather, white , depends what style you are looking for, could be ultra glamorous or a casual boho luxe , love those colours throughout, could look gorgeous

print out some large copies of your photos and draw in the handles and knobs in various combinations to compare the look...vertical handles on the doors and horizontal on the drawers or knobs on everything or knobs on the doors and horizontal handles on the drawers or..??...as you already understand there are so many variations so try the pictures and post a few variations for a poll?

This wasn't your question, but looking at a possible boxed out window in the open plan kitchen dining living it shows just how limited you space is. The following 3D overview shows a boxed out window seat. I have run the kitchen along the same wall as the new window, The Island is 2m x 900 with 1m between the wall base cabinets and the island and 1m between the Island and the wall where your plan shows cabinets. If you have/had cabinets along the other wall as shown on your floor plan they will be 600 deep this would make the island 1400 x 900 which is small. Has your kitchen been renovated and were you considering that, if not. Looking at the overall size of your open plan area I would be considering 1 or 2 large stacker doors to open up to the rear alfresco, that's what I would do but you need to choose what will work for you PS I think that the boxed out window at the front of the house is a lovely idea but possibly not right when it faces West.