...Been here about four years now after moving from Dulwich.
You wouldn't think it's only in zone 5 as it feels like a small village.
The good stuff is: all the restaurants, three great pubs, the common, woods, duck ponds, four miles from Greenwich, 20 mins on train to London Bridge, the people are friendly (generally!), schools are good, Bluewater is a 20 min drive, Bromley 10 mins, etc.
The bad stuff is the traffic can get clogged up and the station is a 15 min walk from the high street. But then again you have four stations all within one mile of central Chislehurst - Elmstead Woods, New Eltham, Mottingham and Chislehurst.
We have young children and the schools are great. A good primary school is Edgebury, try and move to the roads close to the school so you get in the catchment area as it has the best reputation.
Oh, also if you do get the train to London go to Elmstead Woods station its in zone 4 and costs about £15 less a month in travelcards.
Sarah