Troyes itself is worth a visit - beautiful historic town centre. We stayed at the Etap hotel last year on our way back from the Stella - just in case it's pouring down and you don't feel like camping... Unlike the majority of the Etaps this hotel is not situated in the industrial outskirts but right in the heart of the city.
Some impressions:
Have fun at the Stella - hope it's not snowing above 2000 metres this time...