Languedoc & Catalonia along the Mediterranean

Hi, everyone!
I've been thinking of doing 600-700 kms (370-440 mi) from French Valence (Drome) to Barcelona starting February 2nd, and then the same road back starting Feb 11 or 12. It seems a chill ride, all along waymarked bike trails (Via Rhona and EV 8), and mostly flat except maybe the border crossing. I'm looking forward to the sights, sounds and smells of the Mediterranean. Larger towns on the way: Montelimar, Avignon, Montpellier, Narbonne, Perpignan, Girona/Figueres. If you live around there and can host, I'd be happy with a roof over my head for a night. If you'd like to join me for a day or more, also let me know (I'd like to do 100 kms a day on flat roads, and maybe 50 kms on one rougher day). Any advice from people who did this ride before will be welcome.
Stan.