There's few things that strike dread into the heart of any houseproud type more than an uninvited guest.
But while you start fretting about the pile of dirty washing by the machine or the peeling paint in the hall when someone drops by unannounced, what are they really looking at?
Interiors website MyDomaine has carried out a survey of its users to find out the most common things people notice when they visit someone else's house, reports the Daily Mail.
And unfortunately it's bad news for anyone who hopes that guests don't really pay attention to mess, because it's definitely on the list.
Unless you've chosen white or neutral for your walls, a bright colour is bound to invoke a strong response.
Red and brown walls are particularly disliked by people but any garish shade is likely to provoke a strong opinion.
Stick to neutral shades if you want to give the best impression.
CLEANLINESS AND MESS
If you're feeling anxious about your mother-in-law catching sight of the pile of unwashed plates in the sink, it's bad news.
People admitted that they do take note of how clean, organised and tidy a home is when visiting other people.
Some revealed that they feel stressed out by a dirty house because it offends their inner neat freak.
The good news is that while everyone will definitely notice mess, some people see it in a more positive light and it makes them feel better about their own less-than-perfect homes.
People admit that they often mentally rearrange the furniture in someone else's house if they're not happy with the layout.
They also feel jarred by things like pictures being hung too high or if the layout doesn't match from room to room.
Some people admit that they pay little attention to fixtures and furniture, but the lighting is the first thing they will notice.
Natural light flooding a room is guaranteed to create a good impression, but if you need to fake it then the flicker of candles or soft spotlights will also look good.
However, lots of people aren't keen on harsh sources of artificial light such as glaring TV screens.
It seems there's something in the age-old advice to have something delicious baking in the oven when you're trying to sell your home.
Guests reported reacting positively to nice scents, such as a luxury candle or diffuser.
But they are just as likely to pick up on bad smells and form a memory based on the negative.
Greenery around the house also got a big thumbs up from MyDomaine's followers.
Flowers, greenery and plants tend to catch people's eyes, especially how much is visible from the exterior.
But this can quickly turn to a negative if your arrangement is wilted and tired looking.
ART AND BOOKS
Any artwork you have hanging on the wall will capture people's attention, so it's crucial to give a good impression.
For example, one user said the first thing they notice in someone else's home is what's on the walls and what's on the shelves.
Many people pointed out that taste in art says a lot about the individual's personality, so it shouldn't be too generic.
Similarly, people reported being happy to see a well stocked bookcase with titles that say something about the homeowner.
SEVEN THINGS GUESTS NOTICE ABOUT YOUR HOME
Art and books
Messiness and clutter
Plants and greenery
Colour of the walls