š If you have an off-road vehicle or one that you don't mind driving on a dirt road, you can park the car here: 41.684038, 23.411213. From here starts a path in the forest which is well signposted and will take you 2 hours to reach the shelter.
š If the road seems difficult for your car, you can park on the side in the banquette and continue to the starting point of the path, the coordinates of which I left above, on foot.
ā I recommend visiting also the Popina Laka waterfall, which is literally by the road. From the shelter itself, you can also extend the hike to the Yane Sandanski or Sinanitsa hut.
š„¾ Keep in mind that it's a steep climb ahead most of the time.