Cheap
In many ways, Bulgaria is the most affordable country in Europe to visit, and for definitely the most affordable place that wasn't a part of the Balkan War in the 1990s. The majority of the country's attractions, such as museums and historical monuments, are affordable, so you can do a lot of things here on a low budget. You may travel nicely on a budget by taking cheap transportation, eating at discount restaurants, and purchasing glasses of wine for $1.50. Outside of the Black Sea in the summer and a few ski resorts in the winter, there aren't many international visitors despite the discounts. However, some of the benefits of cheap travel costs in Bulgaria are negated by the alphabet and language barrier, so it may be preferable to pay a little bit more and receive some assistance rather than to learn enough Bulgarian to do it entirely unaided.
Although it is one of the more affordable destinations in Europe, keep in mind that you are not visiting for a city break. Mostly rural, this nation contains a few tiny towns and villages. Less than 500,000 people live in the next-largest city after Sofia, and the population declines rapidly after that. On the plus side, that means there will be many vibrant local events and customs. You'll most likely get to experience them firsthand if you keep your schedule flexible and your senses unclosed.