Nah it is not repaired with body filler yet. There were little dents that were fixed with filler, that's all. Well... we want to weld it somehow like this http://www.honda-club.cz/forum/files/p3310601_194.jpg
It is rusted only there.
As I said .. I always wanted civic because of its reliability, kw, fuel consumption, looks etc. I would take care of him, repair it properly, get rid of any rust and maybe modify it, but I don't know if its worth it :/.
Yeah, that was another thing I'm scared of... I would want to sell it someday for sure, but I'm sceptical about the price that ill sell it. As you said, potentially won't get the money back.
About other civics... In our country, in this price range, there aren't any civic in this condition except slower ones that I don't want. It is win or lose. For instance here is this one, but it is in worse condition than ours civ. https://auto.bazos.cz/inzerat/83331262/Honda-civic-6g-4DEK3-sedan-15-Vtec-E-84kw.php
But i came across this focus which seems to be looking good at 970 € https://auto.bazos.cz/inzerat/83215314/Ford-focus-16i-74kW.php
and there are plenty of those so i don't really know what's the best buy for my money.