We came back that way last year, stopping at Teruel, which is a modern but lovely town with an aire near the centre.
The road in Spain was reasonably quiet and well maintained and made a change from our normal route Salamanca, Burgos, Irun route.
Once you go through the Somport Tunnel the road isn't as good, narrow and twisty but we weren't in a rush and took a route straight through France, which was interesting.
I hope this helps have a good trip.