text: 
        // This example displays a marker at the center of Australia.
  // When the user clicks the marker, an info window opens.
  
  function initMap() {
    var uluru = {lat: 41.885, lng: 12.511};
    var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 13,
      center: uluru
    });
  
    var contentString = '<div id="content">'+
        '<div id="siteNotice">'+
        '</div>'+
        '<h1 id="firstHeading" class="firstHeading">Kerala Restuarant Rome</h1>'+
        '<div id="bodyContent">'+
        '<p><b>Kerala</b>, Via la Spezia, 10/B, 00182 Roma RM, Italy</p>'+
        '</div>'+
        '</div>';
  
    var infowindow = new google.maps.InfoWindow({
      content: contentString
    });
  
    var marker = new google.maps.Marker({
      position: uluru,
      map: map,
      title: 'Uluru (Ayers Rock)'
    });
    marker.addListener('click', function() {
      infowindow.open(map, marker);
    });
    infowindow.open(map, marker);
  };
  <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyA1iCAed3rttH-C9cicdvBMUStvbir6lMU&callback=initMap"
      async defer></script>