The Friendly in Bansko is located near the gondola. You turn left on the main road from the gondola towards the old town and then turn right at the cross roads and you can see it from there on your right. It has a little wooden kiosk outside selling pizzas. I can' remember the name of the hotel it's attached to though.
Just returned from Bansko yesterday, The Friendly bar is well worth a visit, two guitarists playing very good cover music.
A meal for three you're looking at between 40 and 50 Leva.
You might have to get there early as its difficult to get a table sometimes.