For all its reputation as the capital of cool, Berlin makes a fabulous family destination. Berliners are generally tolerant of children, public transport is easy, cheap and fast, and the city brims with parks, playgrounds and lakes.
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Mitte is also a very convenient area; try Miniloft, which offers free stays for kids under two, a 10% discount on second apartments and amenities for children (high chairs, pushchairs, baby bedding and activity packs).
City breaks with kids: Berlin, Paul Sullivan, published in The Guardian, January 26, 2017