First, I'm not in RE (hate it), I'm a teacher. Just a happy inhabitant of Tutrakan, Bulgaria, between Rousse and Silistra. Sorry this article is old and needs updating, but hopefully the photos are enough. http://bit.ly/1HUSrBB
If it interests you, though, go nowhere near the several RE developers in Tutrakan: evil. Go there and have a look around. I see plenty of places with prodava on them now and have an excellent lawyer with good English who could put in some calls for you. She charges zip.
Rousse is also an amazing city, not Balkan at all, very old Europe.
Think it's too far from Sofia? Just over the bridge to Bucharest, far superior to Sofia.
And omg, the fishing.