@PamelaPalacios I had the exact same problem with the Coorinberg cottage I recently uploaded. Three whole bedrooms upstairs. I removed roof (not the problem), replaced walls, made little x-shaped walls (which worked for most of the area in the rooms), then, remembering Sims 1, added wall downstairs (didn't help), finally replaced rooms because there was a 2x1 area in front of two of the doors to a bath and bedroom that my sims could not get to (didn't work). I "solved" the problem by extending one room entry 1-tile out and just making it a diagonal wall over the remaining 1-tile area they can't walk in. I just assumed the game hated me personally.
@crinrict I have one that I uploaded that I haven't taken down yet. My earlier version of Coorinberg Cottage. Interestingly, the cat could get in and out of the rooms, but not my sims.
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