Regarding the train, in my student days I toyed with the idea many times because the price can’t be beaten, but it’s a long, long, long ride – never did it.
@SteveR she said she doesn’t want ethnic food so Adonis may not be of interest.
I enjoyed Au Pied de Cochon more than others here seem to have - for a first-time visitor I think it’s atmospheric and the food when I went was delicious (a lot of that depends on what you choose, of course, and their menu does change - the duck shepherds pie I ate there was a special and very rich but very good.)
@erica1 Take a look at this other current thread too.