All accommodation places in the Republic of Bulgaria have been categorized (on the 5-star system) in the following categories:

one-star category – hotels, motels, bungalows, camping sites, family hotels (boarding-houses) and private lodgings;
two-star category – hotels, motels, bungalows, camping sites, family hotels (boarding-houses) and private lodgings;
three-star category - hotels, motels, vacationing settlements, villas, bungalows, camping sites, family hotels (boarding-houses) and private lodgings;
four-star category – hotels, vacationing settlements, and villas;
five-star category – hotels, vacationing settlements, and villas.

More Info :
Bulgaria Hotels
Hotels in Bulgaria Travel Directory