Sofia is beyond amazing, where else can you get a vast cathedral, a huge mosque and an enormous synagogue within walking distance of each other?
For skiers Bansko must be the best. A magnificent mountain, with runs of all colours, and a village which is like a doughnut. At its core is the old town, wiggly streets with mehanas (bars/restaurants) dating back hundreds of years, surrounded by modern hotels, restaurants and apartments.
If anyone comes to Bulgaria and does not visit The Rila Monastery they have missed a world heritage site.
Bulgaria (in my humble opinion) is even better when the snow is gone, walking, birds, butterflies etc.
Bulgaria, for a British person, is still cheap. The locals are ridiculously friendly. The skiing/snowboarding is good. The culture is amazing.
Is this your business?