Having kids while living in the centre of a large city is great, as there is so much culture that is aimed at parents and children. When my kid was small we went to museums and concerts and events all the time that were aimed at kids. There were also several different parks, playgrounds, pools and similar activities to choose from all within easy access. Plus once the kids get slightly older they can use public transport to get around and you don't have to drive them anywhere near as much as if you live in the suburbs.