I don't think it looks that small with 1 child. Yes old style 4 bed houses might have several down stairs sitting rooms etc but newer houses are built more like this, and that's a good size kitchen table so dining room sorted.
However,
Stairs are very right on front of the door. Imagine trying to get a large sofa in, will it fit?
And yes, the bathroom. Is your child dry at night? Will you expect them to come through your room or go downstairs?