You can find Puzl CoCafé at Cherni Vrah bul., 47, building Business Center Vitosha. The closest metro station is Vitosha (line 2). From there, you need to head back in the direction of the center. Once you face the Business Center Vitosha entrance, walk through the main door, go around the reception and take the elevator to floor 6. Then walk 2 floors up.