Originally Posted by
ysolde
There will be a lot of walking and cobblestones, so consider shoes carefully: white sneakers will make you stand out as a tourist; try comfortable, broken-in flats instead, and one other pair of very comfortable shoes. Leave the heels at home.
This may have applied at some point in the past, but it is categorically wrong today.
Among 26-year old women like OP's daughter
white Adidas Stan Smiths and Superstars are easily the most popular shoes and tasteful athletic shoes are now standard wear for young people across Western Europe.