I had the duvec, a vegetables and rice dish. I know, I know, when you hear "vegetables and rice" it doesn't sound too exciting. And if you hear this from the caterer at your cousin's wedding, it's probably not going to end well. But the duvec was really good! I didn't have any experience previously with Bosnian food, but it's seems similar to Turkish food. As with Turkish food, it probably doesn't hurt to specify to your server that you want your dish without yogurt (even if the menu doesn't list yogurt on what you're ordering).
The restaurant is right next to Stari Most, so if you're a tourist in Mostar, you're probably going to walk by it anyway. I'm not sure if I'd say it was worth going well out of your way for, but it's a solid choice. The reviews here didn't really sell me on the place, but as we were walking around looking for a place to eat, I picked it out just seeing there was a vegetarian section of the menu. I realized later that I'd even see it on Happy Cow.
Updated from previous review on Monday July 06, 2015