I have been there many times. I personally think it is one of the most beautiful places in Central Europe (very underrated in my opinion).
I also like how it shows the many elements that define Romania. Bucharest has a distinctly different feeling to it.
Romania has such an incredibly rich history to it, fantastic writers (both living and dead) and amazing music.
Additionally, I'd recommend that anybody who goes to the market square buy a few sweets. They are simply divine!