Hi Artur!
I see, you are quite a good expert already, considering Hungarian jumping hills!
Unfortunately I do not know the position of Szabadsághegyi sísánc, it is on Jánoshegy I suppose, but the former skijumpers know it exactly, some years ago the made a visit there. But as I know, practically nothing remained from it.
Here is an interesting article from a former jumper (who was the member of Omega beat band): http://kovacsics.hu/siugras.html
The english translation is not the best :)
The same is the situation with the Lillafüred jumping hill, nothing remained, as I know. It is somewhere near the hotel, called Palota Szálló.
Photos from this topic here: http://forum.index.hu/Article/viewArticle?a=106241387&t=9134420
Today I found 2 videos:
1. Mátraháza jumping hill: https://www.youtube.com/watch?v=8FnIhXImnlI
2. an interesting video from the 2014 meeting of our former skijumpers in Budakeszi: https://www.youtube.com/watch?v=DLLSSZWLSlo
Anyway, now I found here some details and map of Szabadsághegyi jumping hill: http://www.skisprungschanzen.com/DE/Schanzen/HUN-Ungarn/Budapest/0321/#data
And the other Hungarian places here (even Pécs! but no Lillafüred): http://www.skisprungschanzen.com/DE/Schanzen/HUN-Ungarn/