Ruse, Rousse, Russé, Русе even — so many spellings for such a small city, but it isn't the biggest deal about it, nor it is the thing that makes it unique.
Well, most of Bulgarian cities are each quite unique on their own, but Ruse just seems to be the least similar to others. May be it is the proximity to the border, maybe a unique history, but Ruse is full of very special charm you won't find anywhere else in Bulgaria.
Is is also very green and very walk-able city with plenty of spacious parks to hide from the Summer heatwaves in, and of course the Danube embankment.