To my knowledge I believe they all take single stack magazines.....the key to the conversion is if she has the wide bottom bolt lug...if she's narrow she won't strip rounds from both sides reliably. ..otherwise she has too have a new bolt and be re-headspaced... magwell is pretty simple to open up by mill or Dremel and some time a little modification has to made to the front trunnion to clearance the magazine
If single stack it can be opened up to take standard AK mags.
They make 2 versions of that rifle. One with an AMD length gas system, and one with a standard length AKM gas system. I would (and most would I believe) the AKM length system. That rifle looks to have the standard AKM length system.
If the price is right I wouldn't hesitate to get it, but I would also love to have a hungarian AK.