Some incredibly tight sections with nice width and good visibility, spoiled in places by the queues of cars near the borders and loads of fuel stations (i.e. risk of fuel or road), otherwise nice and a good place to pick up cheap fuel (40% less than in France)
Assuming you are coming from France - you will probably com via D117/N20. When you hit Hospitalet-Pres-L'Andorre you will turn onto the N22. Somewhere about here look to take a break and do what ever you do to prepare.
This is a seriously twisty road - and a fairly fast one - most of the hairpin...