I love Avignon! I spent four solo days there in 2019. I found more than enough to do, and also took the short train rides to other locations, such as Arles (maybe 15 minutes by train); and then for a few days in Nîmes, it was easy. There are two train stations in Avignon -- the TGV, and the in-town station mentioned by MaisonRose.If you stay in Marseille then by train /station St Charles, you have a convenient regional train to (almost) downtown Avignon which is just through the wall up the rue de la République. It’s a nice, walkable City & also benefits from being on the east side of the Rhône. And you can also reach just about downtown Arles which is walkable, too,and has both Roman ruins, shady squares and whiffs of Van Gogh. It too is sited on the Rhône but not in the same dramatic way as Avignon. I second a visit to Aix en Provence and personally would prefer it for the stay. If you plan to drive around I think you might regret being in a bigger city. I live in the Luberon just east of Avignon, so please message me if you have more pointed questions.
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