Egnatia Aviation
I did my faa/jaa conversion at Egnatia Aviation. I'm very happy with the way they treathed me and the way they took care of getting me done as quick as possible. it only took about 10 days to convert my license. My stay was in total 3,5 weeks, that was because the weather in december can be very bad. a lot of icing. But on the good days I was able to fly 2 a day. in sping, summer and autumn the weather should be a lot better.
Only thing I didn;t like is the fact that you have to come in very early in the morning and sometimes have to wait until late afternoon to start flying. this is because of the fact that they provide a shuttle service to an from the appartements in the morning and afternoon. They told me they are working on a solution for this problem. I even think they took care of this problem already.
The accomodation they provide is nice, and if there is a problem they take care of it right away. The airplanes are all new.
If you consider this flight school as a way to convert your license, this would be a good choice. I don;t know about their full zero to Atpl course, but the conversion was very good with them.