That conversion isn’t accurate at all, at least in the cities I have been. I used to trust OSM a lot, but it led me to wrong places a few times. I use Organic Maps, which is based on OSM, for general navigation, but I have to rely on Google Maps for finding precise locations. I use web interface only, for google maps, but OSM can be a pain in the butt, especially if others are dependent on me navigating them.