In short: fantastic location, great view, comfortable traditional apartment, helpful and welcoming hosts.
Both bedrooms and the living room (salon) face the Adour river and old Bayonne. Have breakfast watching the water flow, with the spires of the cathedral in the background.
The apartment is in Saint-Esprit, a trendy district across the river from Petit and Grand Bayonne--it's an easy 5 or 10 minute walk across the bridge to the center.
The train station is a 3 minute walk from the apartment (there is no noise from the station or from the street) and secured parking at the station is 15 euros for 24 hours if you want to leave your car someplace safe. We didn't touch the car during our four days in Bayonne--everything is so walkable.
There are several boulangeries and patisseries and a Carrefour Contact grocery store within a few minutes walking. Also many restaurants. There is a SPAR grocery store across the bridge.
Carolina the hostess welcomed us personally (she lives upstairs) and introduced us to the property. If there was anything we couldn't find, she was quick to help us out.
Wifi worked well.
We certainly will book with Carolina again the next time we visit Bayonne.