One full family, three-ish generations, plus animals.

Assume 2 parents, 2 (living) grandparents, and 3 (living) children, that would put it at 7 people. You might include 1 or 2 ~~no good layabout distant relations~~ relatives, guests, or the occasional lucky great-grandparent, considering the tightly-knit nature of social circles at the time and the general unpredictability of life, to bring it to 9.

So hardly private, but not necessarily crowded either, even with some livestock taking up room. This would be a good-sized home for the period and class depicted. Neither wealthy (by the standards of the peasantry) nor poor (by the standards of the peasantry) - especially with the loft (depicted) and assuming a root cellar.