A guy had his RB on Craigslist recently here in St. Louis, Mo. in the United States. He wanted $200.00 U.S. and claimed it was professionally used in his studio since new. The camera worked perfectly and looked close to new. The camera came with an eye level finder and a 180mm lens.
It sounds cheap to me but I hate buying something that was professionally used.
You can check Ebay's past sales on RB's to give you an idea what they are going for.
I would say your friend is high but that would be here in the U.S. I don't know what would be a fair price in Sweden.