Any tips? I've never been to a retreat yet. Would prefer a Jhana oriented one.

I did my jhana retreat with Leigh Brasington. He is giving retreats in Sweden and Finland later in 2015. http://www.leighb.com/meditate.htm

Been looking for Swedish retreats my self. We dont have that much available really.

Goenka vipassana cost free but donation based
http://www.sobhana.dhamma.org/Centret-i-Sverige.694.0.html?&L=6 

Zen Gården - cost non-member 550kr(64usd) per day, members 350kr (40usd) per day
Above cost is for the intensive sessions. For normal stuff its 250kr vs 100kr.
http://www.zentraining.org/ 

Stockholm Buddhist center
Weekend retreat 500kr(60usd) weeklong 5-8 days 2000-3800kr (230usd to 440usd)
http://www.stockholmsbuddhistcenter.se/retreater/anmaelan-till-retreater.html?task=category&list1=3

Vipassanagruppen (Vipassanagroup) (They are behing the leigh brassington event and its fully booked)
http://www.sangha.nu/svenska/svframe.html

Theravada temple, can stay a few days upon request from what I know.
www.watsanghabaramee.se

http://www.alvastrazen.se/program-alvastra/ have (silent?) retreats for 5 days
http://mindfulnesscentrum.se/Byvalla/Retreat.html weekend retreats

http://www.mediteraistockholm.se/ have some retreats

http://www.mundekulla.se/se have some retreats. some seem very weird so read descriptions well =).

If you are just looking for silent retreats of sorts quite a few of the christian monestaries have lodgings.

Thanks for the links! The Brasington retreat is already full booked? Noooo D:
I'll hopefully do a Goenka course as soon as I can this summer.