Hello Dido, 
I went on this holiday last year with Philip and had an amazing time. Beautiful scenery and a different evening activity arranged every day. Excursions were generally good, but no snow until end of holiday.  
Three tips: 'stock up' on Bled cake - time for dieting in the New Year! 
Make sure you try the chocolate drink on the island - a chocolate drink like no other! 
If you haven't, pay extra for lake view, worth every penny. 
Have a great time.