In Sofia - Bulgaria, plenty of guests who think that Location means Oxford street in London and Champ Elisee in Paris, therefore they simply write that Location was not right in the Center - so 4 stars. Was Location in a good neighborhood - yes, I agree, this is better than only Location.
Have in mind - guests who plan to visit Sofia that many accommodations would be closed from June or July as the Governement decided to level Airbnb with hotels as rules, taxes, ect. Visiting Bulgaria which is an extraordinary country - will become more expensive than going to Luxembourg.