Not a fan of stripes myself, but go with what you like. Definitely borrow samples from the carpet shop and look at them in different places in the area and at different times of day. We found that what we thought was the right colour was actually too dark in our HS&L when put the samples on the floor.

One thing I would say is choose good quality carpet & underlay if you can afford it.

I lived in a rented house that had that striped carpet & it was the cheapest nastiest carpet ever, very nylony (if that's a word). Made the stairs so slippy.

I've recently gone for a very thick grey carpet with light striped wallpaper on one wall & off white paint on the other. It makes it very light & airy.

Oh and buy underlay, any gripperods and door bars yourselves online from somewhere like here - miles cheaper than with the retailer's mark up. The more you buy the better the cost psm so if you know you are going to carpet elsewhere soon, buy enough for both areas.

try to go for an 80/20 mix of wool and synthetic - i have a striped carpet on my stairs, a westex which is lovely quality, i brought home loads of samples until i found one that really worked.

Take your time and don't be pressured. You have to live with it.
Do look at samples that you like but aren't perhaps what you were thinking of. We were thinking various shades of beige throughout but I picked up a slate grey/blue (called teal but looked nothing like teal) just because I liked it. My husband said 'no, no way' but I put the sample on the stairs alongside the others and it looked great, we ended up having that but beige elsewhere.

I would suggest choosing a carpet with a slight fleck to it, then every little speck doesn't show up.

Do not buy a carpet with a 'velvet' type finish as over time the pile flattens where it is trodden on and you can see lines where it has been walked on.

Buy something neutral and the best quality you can afford, ditto the underlay.

Definitely agree with everyone about taking samples home and looking at them en situ at different times of the day.

My son has the stripey one in his room (well,May not be the same as such,his is from carpet right and has a ten year guarantee?) and it looks fab down and is still perfect after two years of him throwing himself on the floor,chucking drinks and all sorts on it (severe autistic teen so it's taken some battering!)

What colour are the walls or what colour will they be? What kind of look are you going for? That will make a difference to how the carpet looks aswell. Ds has 3 light silver grey walls (duly polished pebble) and a bright green feature wall and alcove which,combined with chunky white furniture,green desk and curtains and the carpet looks modern and funky.

I think thick stripe carpets can look a little odd or old if placed with something too normal and 'boring' though and they look better with a strong balance,I think finer stripes work better for plainer/more standard/less statement areas.

Deffo need good underlay,it makes a huge difference.

I second the suggestion of a flecked carpet too,my stairs I now have a black carpet with white flecks that kinda form the corners of squares. It hides everything better than any other stair carpet I've had.

BUT I'm not big on this whole different carpet on the stairs than the one in the hallway and landing though,I personally think it would look daft. Wooden flooring in the hall then the stairs and landing carpeted - yes,but different carpets on each one I just don't get tbh

We have just done a whole house up and went for the following - painted grey floorboards at bottoms, grey stripes (very similar to your picture) on stairs (we avoided a runner as they seem to create a lot of dust from what people have said and I am not keen on hoovering) and then picked out one of the colours for the landing - it's a peat grey - attached some pictures. We are really pleased and think it works well with the walls. The hall is North facing but gets a fair amount of light on it.

Forgot to add. The whole house is fairly grey in colour so it works well with the flow of things.