The workshop will be held on the campus of Halmstad University in Halmstad, Sweden. The meeting will take place in the university's board meeting room on the 21st floor of the trade center building.
The official directions for getting to campus can be found here. To simplify matters, if you are flying in internationally you might find it easiest to fly into Copenhagen (CPH) airport, which is locally known as Kastrup (as on the instructions on the above mentioned page). The best thing about flying into CPH is that you just buy a train ticket and take a train to Halmstad when you arrive. The train leaves from the airport itself. Once in Halmstad, everything is either in walking distance or a short cab ride away. Usually there are cabs at the station, but in case there are none there is a little phone that connects directly to the local taxi company.
Note that CPH is in Denmark, which is a different country. So, if you need visas for European countries, make sure you get one that works for both. If for some reason you cannot or do not want to use CPH, the next best international airport is in Gothenburg (GOT), locally known as Landvetter. The tricky thing about using that airport is that you would first have to take a 45 minute shuttle from the airport to the Gothenburg train station, and then take the train to Halmstad. That's one transfer and one wait.