You can't have it any more central in Sofia. That's the pro. The cons are that while the lobby has been renovated, everything that I care about in a hotel (rooms, breakfast, the hot water boiler for the shower) hasn't. It's still showing its origins in the communist Era a lot.
Although, coming to think of it, you might want to book one night as an adventure. The evelators and the view are quite cool as well.