My uncle made a wartime trip to Sweden but I think it was in 44 or 45. I remember him saying that there were two customs lines one for his crew and one for German speakers. I also remember him saying by that point in time the Swedes had split the hotels and restaurants in Stockholm into two groups. They ranked them and put the odd numbered restaurants and even numbered hotels in one group and visa versa with the allies allocated to one group and axis to the other. This was apparently due to some altercations between the two earlier. He did meet up with a friend who was interned there as well. Said the Swedes were very correct with most internees (Norwegians being the exception).
Not sure how relevant this was but hopefully it will be of some use.