We were very busy during our stay but we had no problems with self check-in. Carina is very nice and considerate. We had the pleasure to chat with her a bit before checking out. Her place is a great place to stay if you prefer to be away from the hustle and bustle of Oslo's city center but still be accessible. The nearest train station (Holmlia station) is just an 11-minute walk or 3-minute bus ride away.