Without spoiling too much, you'll probably need a separate room or at least room corner for virtually every aspect of medieval life... except an outhouse. That's probably not going to be needed.

I like to keep my things stored near the facilities which require them. I have a lodge of sorts with one big open space instead of separate rooms, but there are various screens and several floors which break the building up in what could be thought of as rooms. Let me think...

The outermost defensive walls are something like 80x80 by area, I'm currently in process of measuring and expanding that to achieve proper symmetry and some additional fortification.

Between the rectangle exterior walls and the circular stakewall, there's beehives, charcoal kiln, obliterator, some workbenches and stonecutters, and refinery.

The inner yard contains open-air smithy, a small cabin for spinning wheel, the mill, a small terrace for cartography and maybe some future things, treasure chamber, wizard's tower with portals, and various storage piles for firewood, coal etc.

Inside the lodge, the first floor contains there's the entryway with storage and workbench, a small living room confinement with fireplace (the place for resting), a dining area with storage for food, the kitchen, bathing area and brewing vats. Most of the chests are on the first floor since the building gets more narrow upwards. There's various trophies and decorations hanging here and there.

The second and third floors have enough space to allow for smoke ventilation to work without need for actual chimneys, as well as quirky stairwell which first goes up to second and third floor and then down to other side of second floor. Two bedrooms (lofts) are found on the second floor, one for me and one for a guest. The wizard's tower is accessed from second floor.

The final floor contains a sort of expedition portal, little bit of storage and entrance to the balcony, as well as the descending staircase to the other loft area.

https://steamcommunity.com/sharedfiles/filedetails/?id=2930845517

So that's, uh... 11-12 facilities outside and about 9 rooms or spaces with a unique function inside. My farm and pasture are found elsewhere and accessed by portals.

You could always simply have everything in a convenient longhouse or a long castle hall, especially if you want to put up signs for where everything is stored or house multiple guests. An armory with armor and weapon stands could also be a convenient addition at some point. If you want to build vertically, you should do that with iron beams instead of something like core wood beams, although the latter certain has its aesthetic as well.