The centre of Sofia is actually not that small, especially if you want to go sightseeing and get the best of it. If you can give yourself a free day before/after the festival, it will be great! We recommend you to take part in Free Sofia Tour (http://freesofiatour.com/). These guys are ready to show you and tell you all about the important and interesting places in Sofia’s centre. It happens every day, twice – at 11 a.m. and 6 p.m., the duration is around two, two and a half hours.