We have a brushed steel Brabantia jobby which is going ten years now and looks perfect. Worth the ludicrous 80 price tag imo back in the days before kids when we could afford expensive accessories
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We separated the lighting as you either shower in the dark/twilight or switch the light on and the extractor comes on with it. If you are using an electric shower, you might be able to link the two things?
You can set a timer so it only comes on after a few mins which is handy for a quick pee in the dead of night but you have to be quick!!
Some of the new ones work on the basis of moisture in the air so will keep going and going so beware if there's no window in the bathroom. You will definitely want an over-ride switch to knock it off.
Bunny had her tummy scrubbed with stripey toothpaste and a toothbrush the other day as part of her "bath". The bath towel bought it at the same time and the whole place was soaked. It only took 5 unsupervised mins with a near 4 yo just at the point when you think you might have escaped that particular stage ... Suddenly the bathroom is mega interesting as a playroom. Bunny is going to have a long, v long, summer in the paddling pool methinks.
Oh - a soft close toilet lid is fab, so no huge crashing noises.
Beware fancy and usually very stiff buttons for flushing too - my 4yo can only just manage some of the fittings.
A hidden cistern has been a great destresser. No prospect of anyone taking the lid off and dropping it on the floor/toes to see what's inside.
One final thing - sorry if this is TMI. There are toilets which have a shallow bowl with the water towards the back and toilets which don't and have more of a straight down design. The former will have more skid marks than the latter necessitating the frequent use of domestos and marigolds or gasp the dreaded MN toilet brush. Regardless of your personal opinions of toilet brushes, if you can avoid the necessity for one in a children's bathroom, that is A VERY GOOD THING. It's just one more thing to clean and remove from small fingers as they try to "help".
Best of luck - I'm still wishing I'd had the forethought on the toilet design question. Would have been a horrendous conversation in the showroom though !! I'll bet you anything if you posted a link on MN to your chosen model though, someone will have it and be able to tell you.