They have nice premises just next to one of the TWYs. I've been a right-seat pax in 2 of their PA28s (SE-GPD, SE-GNL) and they are up to the standards that you can expect. They also have access to SE-LLP,
http://www.airliners.net/open.file/733821/L/ -
http://www.airliners.net/open.file/859946/L/, a Piper PA-28R-201 Arrow III.
Some friends who have trained for their PPL at Sturup IFR Center have all been very satisfied with the instructors.
PM me if you would like some more info..