Nice. Suits the characters. But (there's always a "but")... That bathroom is about the right size for the two closets they don't have insert-obligatory-closet-joke-here. Your art design doesn't really cover extensive wardrobes, so maybe it's just world building (joke, not critique). If everybody showers at the gym, the bathroom is probably big enough. The girls may find more of an issue with that than the boys did. Pick, pick pick.
I'm just thinking that the bathroom is too small to fit a shower, toilet and sink. (The necessary features for an apartment bathroom, bathtub optional.) The whole apartment would need to be larger horizontally to fit those in. Of course, it doesn't really matter either way.