Its Gothic cathedral dominates a charming old town (vieille ville) of medieval and Renaissance houses on Rue Saint-Martin, Rue Saint-Malo, and Rue Bourbesneur.
The  town is very new and modern. 
mnli hypothesis: The  town is very new and modern.  premise: Its Gothic cathedral dominates a charming old town (vieille ville) of medieval and Renaissance houses on Rue Saint-Martin, Rue Saint-Malo, and Rue Bourbesneur.