Austria is excellent but indeed relatively expensive. Hungary seems to be more bureaucratic here and there but they are cost-efficient and effective. I heard that the Polish CAA is slow and another flight student told me that the Romanian CAA is "complicated". A pilot I know mentioned a few months ago that the Swiss CAA is difficult to deal with when when someone's practical training was conducted in EASA countries "which are different from them" and the Swiss are requested to issue a license or rating based on that. These are all rumours, but I can myself confirm that Austro Control is doing a good job.