The walls and beams are so beautiful, you don't need a ton else because they add so much texture and interest to the space.
I would get indoor-outdoor rugs. Easiest to clean and you don't have to worry if there is ever water damage. Let the pattern in your space reside in these rugs. Get a runner for the kitchen, one to define the dining area, and one to define the living room area.
Pull the sofas out from the wall by a few feet. Float them on a rug. Use a big upholstered ottoman as a coffeetable. Get one with storage - a good place to stash extra pillows, bedding, whatever.
I'd put one interesting picture on the wall in the kitchen above the sink. A large horizontal rectangular piece - something abstract that is either black and white or earthtones. It will photograph well in listing pictures.
Do you have counter stools in mind? I'd be thoughtful about what looks good in the space and doesn't clash too much with the dining room chairs. The dining room chairs are fine and functional but don't mesh with the rest of the furnishings in my mind.
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exterior
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