With only two drag lifts and one 800m piste area, this may not be the first choice for experienced riders and skiers.
However, if the snow in other parts of the country is bad enough, it may be worth calling ahead to see what their snow conditions are like as they often fare better than most. It is only about 90km from Sofia, after all, so it may be worth a day trip.
And you can always take your shovel and go get some air if you really do get bored!