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@{
  var longitude = Location.Longitude.ToString() ?? null;
  var latitude = Location.Latitude.ToString() ?? null;                    
  
  var googlemapSource = "https://www.google.com/maps/embed/v1/";

  if (!string.IsNullOrEmpty(latitude) && !string.IsNullOrEmpty(longitude))
  {
      // map mode
      googlemapSource += "place?";

      // cordinates / adress (has to use a dot not comma...)
      longitude = longitude.Replace(",", ".");
      latitude = latitude.Replace(",", ".");
      googlemapSource += "&q=" + longitude + "+" + latitude;

      // zoom level               
      googlemapSource += "&zoom=" + "10";                       
  }
  
  else
  {
      // map mode
      googlemapSource += "view?";
      
      // default location
      googlemapSource += "center=" + "39.60342576096072,2.9043215749999978";

      // zoom level               
      googlemapSource += "&zoom=" + "8";                      
  }

  // API key
  googlemapSource += "&key=" + "AIzaSyAVn6ea2iJcMq9Wp0pKGlr3RpA8SVK1MCM";

  // map type: roadmap or satellite
  googlemapSource += "&maptype=" + "roadmap";
  
}
<iframe
  width="100%" 
  height="280" 
  frameborder="0"
  style="border:0"
  scrolling="no"
  src="@googlemapSource"
></iframe>