<link rel="stylesheet" href="https://unpkg.com/leaflet@1.4.0/dist/leaflet.css"/>
<script src="https://unpkg.com/leaflet@1.4.0/dist/leaflet.js"></script>
<div id="mapid"></div>
<style>
#mapid { height: 400px; }
</style>
<script type="text/javascript">
var mymap = L.map('mapid').setView([48.823269, 2.276107], 13);
L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=pk.eyJ1IjoibWFwYm94IiwiYSI6ImNpejY4NXVycTA2emYycXBndHRqcmZ3N3gifQ.rJcFIG214AriISLbB6B5aw', {
maxZoom: 18,
id: 'mapbox.streets'
}).addTo(mymap);
L.marker([48.823269, 2.276107]).addTo(mymap)
.bindPopup('Repotel Issy les moulineaux')
.openPopup();
</script>