I'd still be concerned about your mother and a walker in the bathroom. How much room is there between the shower and the toilet? Plus where will grab bars go? There's so much extra room around the space that you'll need to put in floor grab bars which are a heck of a lot uglier than coming in and seeing a toilet. I do agree about the doorway into the guest room. However I don't like where she placed it because now you are limited where you can put the bed and I think the solution is worse. The width of the bedroom is 10'8" or 128" wide. Putting the bed between the wall and the closet on the window side (so the foot of the bed faces the entry door), means you now only have 68" of space if you use a queen sized bed. (A queen mattress is 60" wide) So that means now your mother only has 34" of walking space. Not even a full 3" on either side of the bed. If there's a bed frame, then it's even less. If you place the bed on the left wall you only have 126" and you need 3' for the door swing. So now whoever is on the window side of the room has even less space to move around. So while it solves the problem of the two doors, it really creates another problem because of the bed. By keeping all doors on one side, and keeping the original size of the bedroom, the bed can be placed between the windows because the original room width was 11' or 132". That gives a full 3' on each side of the bed. Also note that clothes don't turn corners in closets. That's the reason I left that area blank. It can be hanging for things like ties or belts, etc.

Not everyone can afford "mistakes"! You can only have so many stars in a room, or all will beg for attention . If you love your flooring, faucet , mirror and light!? Paint the walls a glossy deep gray! Go buy some oversized / peony art for the wall! There are MANY ways to make a beautiful powder room, and infinite ways to combine too many elements taken out of their context....... And cry real $$$$.

I offered a layout with private vanities and walk-ins but I must say, I like my first layout: - No risk of locking some out; - Long continuous counter top (I think teenage girls would prefer that over a small private vanity); - I like the deck at the end of the tub to keep toys (or all kind of different products when they get older); - All doors are 30" wide; - More storage in closet; - More spacious overall; - More natural light; - I like a J&J in this format. One teenage girl can do her make-up while the other is in the shower. A S posted the layout in her house that is similar to the one I drew and she said it works like a charm. - I think sharing the vanity is just one other way to get siblings closer and learn the values of patience, compromise and sharing. Note that a custom order of a 2'4" wide door for the bathroom's door would be a little better (even though it does not change the space in front of the toilet) and I would slide the door the other way to be able to mount a toilet paper holder on the right wall".

You actually have 4 bathrooms in that small apartment? Wow. I'm not sure what you mean by "pre-build apartment". Do you mean that you can modify the layout because it's not built yet? Or do you mean, is was pre-built and then you bought it? If it's already built, solve the problem by just keeping the door to the bathroom shut. If it's not already built, then I would solve the problem by combining the 2 adjoining bathrooms into one space, accessible from the bedroom. That's what I would do.