My sisters house.
Everything is very neutral (even her clothes) & it all pretty much goes together.
Even if you grabbed a decoration from one of the bathrooms & stuck it in the living room it would look like it was meant to be there.
She relentlessly throws things away, she has almost no 'clutter', she lives with a Pomodoro timer & if she isn't working she's cleaning or deep cleaning one Pomodoro at a time & in between she's a really tidy person who never puts anything down except in it's proper place.
It was always like that & she has always worked full time, but it's easier now, as it's a lifelong habit for her & her kids are now grown up & have left home.
To be fair, if people are visiting she is really welcoming & doesn't mind them making a mess, but you'll find after you've gone to bed she'll be up putting it to rights so it's back to perfect in the morning.
Her last house sold in 2 days.
She just decided to sell, let them in, they took photos & the estate agents kept going on about how easy it would be to sell 'because it looks like a show home.'
Mine only looks good (but not really show home) when there are no kids in it.
For some reason I'm messier too when they are around.