Hi Els
www.aupredupoirier.com/
Is the B&B. We have stayed there 3 x and they have 2 sep but interconnected rooms, a fab breakfast and good home cooked 4 course dinner (served sep for DCs) all for 96 Euro.
It is about 10 mins from the Avallon turn (which does mean going via Paris as it is a bit off from the Calais / Reims/ Lyon route).
We did the Col on the way back this time and it was a bit dodgy. We had chains, but didn't put them on, although we took it very slowly. We probably should have done...but it was quiet and we were fine.
If I was you I would check the reports - it it has snowed recently it might be best avoided, but will be fine if you have chains (and know how to use them).
It is a beautiful road - well the bit from the top to Briancon is fab. Not so keen on the Grenoble to top bit - it is dark and cold and at the bottom of not v attractive valley.
It is a major route, so don't worry about "dodgy mountain passes" and big drops. I do get the heeby jeebies badly (Col de Galibier for eg), but not on this one.
hope you have a fab time in Puy! Save some snow for us!