I have watched this movie after finding out about it online. I didn't expect to watch overwhelming special effects or perfect film making. Keep in mind this was filmed in the '70s in Yugoslavia, and for TV. To make things worse, the recording I watched wasn't of extremely high quality (maybe a rip from a very old home recorded VHS).
The movie is seriously scary, but with some comedic relief which might be considered annoying if you don't expect to see them. Plot turns and surprises are well thought of in most instances. There is no attempt to "explain" the plot to the audience , as commonly happens with more modern western movies. I find this to be a nice thing, but some may find it a problem. The vampire the movie tells about is not a typical vampire from western movies, but maybe the retelling or older and more original Slavic legends.
The actress playing the protagonist's love interest was a treat. Beautiful and convincing, hard to believe she did not appear in famous movies. Effects rudimentary, but kind of convincing. Scares real. True that the vampire appears in three scenes: that's enough however. Those appearances are sudden, and only in one case can be expected.
Definitely advise for horror fans (with the caveat you are not watching Hollywood).