The FIS is friendly, but ATC is often clunky, and it is not as wide open and free as one might think, just take a look at the Highland Restricted Area which takes up a huge portion of the country.
The Highlands Restricted Area tops out at 5,000' and considering most of the hills in there are >3,500' it's not that much of an imposition....and it's only active weekdays....
I flew a lot in Norway 12-13 years ago and found it to be extremely aviation friendly....and cheap...and stunningly beautiful of course....in those days a Warrior or 172 rented for ca. £50 per hour cf £110+ in the UK...