Capital: Sofia – one of the longest continuously inhabited city in the world
Transport: I used Omio to book transport around Europe and it’s great to have all my tickets in one place. I only used buses and sometimes had to book locally.
Currency: Bulgarian Lev, 3 lev = 13 HKD = 1.66 USD. Card payments are generally accepted.
Sim Card: Many sim cards are valid for entire Europe
Handy Apps: TaxiMe for taxi in Bulgaria, and Google Translate was a great help with menus and museums.
Language: Bulgarian, which is similar to other Balkan languages.