try vitosha ski centre but not during the weekends for a different skiing,wide open spaces,very windy on top quite dificult Wall and pleasant day out skiing.
The best is drive on the Sofia ring road to the bottom of Gondola from there -30 min and you are in a very snowy place.combine this with evening in Sofia-plenty restaurants,bars night clubs .it is worth visiting .
here is the link for the webcam
http://motensport.eu/index-cam.html