At first glance, I also do not like the staircase in this case. In addition, you run into a wall at the top of the stairs. I would definitely place the guest area downstairs. The living area feels a bit cramped for several people, especially combined with the staircase issue. Air conditioning is a must; I would always build with air conditioning here as well; these costs are manageable. I find the guest WC on the ground floor misplaced, so close to the dining area with a sliding door that is probably mostly open anyway, plus another door. Regarding the kitchen, I am not sure if the storage space there is sufficient, and I miss a strip window above the countertop. I would only install roller shutters in the bedrooms and use venetian blinds in the living area. Whether you really need that there by the roof overhang, I don’t know, but maybe you can plan the electrical wiring there and retrofit spot blinds easily if needed. These adjustments (staircase, guest area, WC, etc.) would therefore lead to a different/new design, but you are still in the planning phase; there is room for improvement.