Hello Karolinka,
I am a Peace Corps Volunteer serving in Kriva Palanka, Macedonia right across the border from Kystendil.  You must love Sofia to be on year three....I am just completing year 1 and am having a wonderful time here as well.
I stumbled across your site as my 2 sisters and my 28 yr. old daughter are arriving for a week in September, and since they are flying in/out of Sofia I was looking for some advice on what to see/how best to get around in your fair city the day before they leave.   My e-mail is Lindaereynolds@gmail.com and I would greatly appreciate any thoughts.  Thanks in advance!
Linda