I called SkyEurope in Poland today (no ridiculous call centre fees, just used a long distance card for about 3c/min).
SkyEurope does not issue refunds to credit cards

SO BEWARE! They can only deposit refunds into bank accounts or the second option which is far more appealing to me is that they can rebook the cancelled flight on ANY other SkyEurope systemwide flight even if the flight costs more on any date