Safe and Calm Country
Bulgaria is a very secure nation. The majority of young people have a respectable degree of English proficiency (the older not so much, since they had to study Russian during the socialist period). There is basically no danger of being robbed in Bulgaria because of its lack of population (contrary to the popular tourist destinations and spots). Without continuously worrying about your belongings, you may take leisurely strolls through the cities' parks or along their main pedestrian streets.
There are few violent crimes, and crime overall is low. The majority of the population is Christian Orthodox, and the residents are generally welcoming to visitors. You should, however, take good care of both you and your possessions. Considerable safety measures should be taken, especially in larger cities, to prevent street violence. In tourist locations and in busy transit hubs, such as airports, be on the lookout for pickpockets and bag theft. Be watchful at all times, but especially at night. There is also Sunny Beach, a renowned beachfront resort. There are several problems in Sunny Beach, albeit not necessarily in all of Bulgaria, including an uptick in thefts and shady taxi drivers. Bulgaria has a significant and well-entrenched organized crime and corruption problem.