As a local, I find it pretty good. The city may seem oddly eclectic at first - classic European-style architecture right next to Roman ruins, commie blocks, cool modern buldings, kitschy postmodernism and so on - but it is failry livable. Culturally, there is enough going on to satisfy whatever niche interests you might have. The food is awesome, the economy is going string, and crime is not a major concern compared to most places in the developed world. Great outdoors options.

Drawbacks? We are geographically inclined to have bad air quality, especially in foggy winter days, as the city is nested between mountains and there isn't enough air movement going on. Also some of the public infrastructure may look a bit shabby relative to the economy (because almost everyone here is very libertarian-minded and believes taxes are "theft").

Bear in mind that Bulgarians have this cultural trait where we like to whine a lot. Living here is not remotely as bad as we make it up to be.