Vastervik fishing camp is OK. Cabins are quite cheap but the boat prices are high. Little bank fishing. I used a tube last time I went there, its quite a shock having large seagoing vessels passing within a few hundred yards and getting hooked up on seaweed and the wash gives a ride better than you can get at Alton Towers

If you have hired a car some of the access to the shore is very limited and very little parking on the road sides.
If you want to fish lower down Sweden say round Malmo then I can give you the name of a guy who could help. Also another friend who lives near Vasteras who may be able to help.
Round Gothenburg the sea trout fishing is good a chum of mine who lives there has caught all sorts on fly - cod, conger and flatfish