ymaps.ready(function () {
  var myMap = new ymaps.Map("map", {
    center: [55.8422,37.5016],
    zoom: 16
  });
  myPlacemark1 = new ymaps.Placemark([55.8422,37.5016], {
    iconContent: "",
    balloonContent: "125493, г. Москва, ул. Нарвская, д. 21"
  });
  myMap.geoObjects
  .add(myPlacemark1);
});