Living in Copenhagen, your only close (and essentially only) option is Roskilde Airport. Hope you have a car, though! "Learn to Fly" and "Greybird" are in Jutland, so I'd rule those out. Aircat has been around for about 40 years or so, that could be an indication of it being good. In Roskilde there's also Ikaros (
Forsiden ), which has been around for a similar amount of time. While the Evektor and Tecnam aircraft offered by some are great and cheap little aircraft, they may not be so easy to find for rent elsewhere, and they do handle a bit differently than your standard C152, C172 or PA-28.