I’ll get the ball rolling with a few basics – but as Ethan says, I wouldn’t think these are news to you ;)

– A renovated kitchen and/or bathroom is a big plus. Don’t overdo it, though – we sometimes pay a bit more for these upgrades but not as much as people might think. That said, it definitely gives an edge over otherwise comparable options.
– Broken lights, sprinklers, cupboards etc can make it seem like the property has not been well cared for, so it’s worth paying attention to these small things before holding a viewing.
– Trim lawns, weed garden beds and remove any dead plants.
– Attractive furnishings are good, but remove as much clutter as possible – it makes the space less compelling and creates question marks about hidden damage.