It's really hit or miss. If you do any edits or answers any questions maps will try and ask you to confirm things others have suggested. But if no one else in the area does that or confirms. Then it'll just ask you again to confirm the thing you already told it a month ago.

I finally broke down and just asked my friends and neighbors if they could confirm that the entrance to our multilevel apartment building was at the corner with the elevator and not the back maintenance entrance so ambulances would stop going to the back and could actually get into the building!

After 2 of them submitted that the entrance was at the front of the building google maps finally changed it. But I had been trying for months before I asked others to set it to the same exact spot on the map.