Expat Real Estate website
게시한 사람 삭제된 사용자 속 헝가리 공개토론
Not a rental site, but I know they have flats for rent if you contact them. Two expats in Budapest started this and really have a good handle on buying foreign property in Hungary. Helped me buy my flat and walked me through the process.
www.rooste.co or www.rooste.hu