Use nominatim/Government API when possible to detect exact GPS coordinates
For some posts (ex: https://www.selogerneuf.com/annonces/investissement/appartement/rennes-35/112639917/) the actual address is available.
When that's the case, a request to nominatim or Adresse API should be made to obtain the longitude/latitude and place precisely the housing on the map.
Edited by Nicolas Frandeboeuf