Mayka 

Mayka is a very nice, nearly 100% vegan place in the center of Belgrade. We were served by two nice, authentic people who were very friendly and helpful in making a decision. Mayka has a pretty extensive menu. I had a good ms. Piggy burger which tasted great. Also they serve a quite good range of drinks. I had two different local beers from Belgrade.
I had the meal outside, but upstairs is a very nicely decorated area where you can eat as well. Whenever you are in Belgrade and if you like vegan or vegetarian food, I highly recommend to visit Mayka for great food. We did not have any salad, but it seems they have next to the burgers, curries and other dishes also a good selection of salads.