the free parking is optional if you want to park far away on the steet, especially if you are foreigner and you dont know about the parking rule and plus you dont read Norway sign on streets！i end up parking in a nearby hotel, cost 350kr per night.
i would highly suggest you dont drive in Oslo, it's just so no convenient.
very great location, the view is so Good, room is very very clean but too small bed for two, although the price is reasonable in such area！