Street Complete is rather good. I filled in a few details in Hong Kong (come on you lot, the population density there is huge!) recently.
Street numbering is generally quite awful on all maps. Google has made a right old hash of much of my town. It manages to put a hairdresser in the middle of the road on the exit from a pretty large roundabout and a taxi company on a small C17th Methodist cemetery.
The entrance to my own company as shown by Google would involve a multi car pile up thanks to the massive "intelligence" that can't manage multiple requests for a change from someone who is listed at Company House, who uses a 20+ year old Google account with the same name and a company email address with the same, quite uncommon surname, in it. I have tried multiple ways to address getting Google to correct their fucking map. I've even tried simulating their own instructions in my correction attempts.
Go on try it yourself - which little UK company am I MD of? Go and find it and put street view on to see why driving through a railing, pavement and a 20' retaining wall is a bad idea. No, it isn't hard for humans to figure out but it is hard for the clever kiddies at Google to get their algorithms let me fix their fucking map to find the actual entrance and the route to it.
In the UK a postcode can cover something up to 100 properties, as required. My business is in a fairly odd stub of land and has its own postcode. The other property adjacent, within the same plot also has its own postcode.
A fairly large dose of irony is that I do occasionally do reviews for Google and am apparently a guide or some such nonsense and my reviews have 1000's of views. My reviews are treated as gold (and might help or hinder a business) but my attempts to fix a real issue with my own company address is ignored.
Just fixing up street numbering will make a huge difference to navigation but Street Complete covers much, much more. I've also done my best with the paths in my local [edit: sp] park, to describe accessibility and "cyclability" etc.