The apartment is located in Gravelines.

Here’s an idea of travel times from nearby cities:

Calais: 30 minutes
Dunkirk: 30 minutes
Boulogne-sur-Mer: 45 minutes
Le Touquet: 1 hour 10 minutes
Lille: 1 hour 25 minutes
Brussels: 2 hours 15 minutes
Paris: 3 hours 20 minutes