When you arrive in Vannes, take the direction of the SNCF station.
Head towards Avenue Wilson, passing under the bridge at the SNCF station.
At the second traffic light, pass a garage on your right and turn left, towards the rue du Régiment d'Infanterie.
Go 500 meters and you will see "at the bottom" a school.
Do not pass by but turn on your left at a kind of fork and go down the street0
You are in the rue de Metz.
The house is on the left halfway up the street.