So a bungalow for 4 people is quite something. We also have one, but with a correspondingly large building envelope, and it was still tight for us. We had to do without a study. Otherwise, I have seen worse floor plans. I find access to the parents' room through the living room kind of semi-tragic. We had that in our apartment back then, and it never bothered us. How old are the children? The space requirements in the hallway depend on that. Especially with toddlers, you do need a bit more. Also consider whether you want to plan a staircase to the attic already. We have a hatch, and I regret not investing in a staircase right away. I have to go up there so often ... but it's also a question of your budget.