Think no one in Sweden is really good at ferrets. Mälardalen is probably the better near you. http://www.malarensmadjur.se/

Yeah, we have thaught a local vet about the basics of ferrets (http://enkopingsdjurklinik.se/) , but more serious stuff  than vaccinations and regular check ups are better to go to Mälaren Smådjur and Marianne Tornvall.