Think it's more like 200 miles from Copenhagen to Kalmar by road. I visit a factory in Ahus fairly regularly, which is about half way between Copenhagen and Kalmar. No idea if there's a train. It's mostly single carriageway after you get into Sweden and it can be fairly slow going.
The hotel I usually stay in is around £120/night with breakfast and dinner and is nothing special. I think beers are around Kr50-60 for a half litre, so 5 or 6 quid. I'll do a more extensive study next time I go.