Located a little bit distant from the downtown, although even a minimal familiarity with the city should remove that obstacle (it's really not far even on foot). Conveniently located for travelling to and from the fairground. Several 24h stores very close. Adequate wi-fi in rooms.
Inconvenient bathrooms (no shower curtains etc. as the other reviewers noticed). Some quirks in rooms as well (too few electic plugs for a decent hotel room in the 21st century is one example).
Food in the hotel's restaurant is tentatively adequate, but choices are too few for a decent restaurant in Europe (let alone for a restaurant in Bulgaria as a nation that earns highest scores for excellent food and drinks).
The restaurant adds an another inconvenience: loud parties until late night on those days when the restaurant and its luxurious pool area are leased for concerts, weddings and other such events. It makes quite a noise in rooms, especially those on the same side with the pool area, and such events are very frequent at least in the high season.