We used to live in a very small flat in posh St. John's Wood until last year and we wanted a three-bedroom that would fit our not-london-friendly budget that was very low, since my husband is not a massive fan of real estate.
At the end we compromised for a three-bedroom in Harold Hill and it was the best decision ever to be honest (his words!).
Before taking this decision we explored the area a lot: Harold Wood, Chadwell Heath, Manor Park, Brentwood, Hornchurch etc...
Houses in Harold Hill in the end of 2020 were WAY underpriced! You could easily spot that by checking all the areas inside the M25 in London in the 350-400K price bracket.
I think it's pretty personal but Harold Wood was better in terms of proximity to the tube but it lacked of the nature around, same thing with Chadwell Heath, Manor Park a bit too much "exotic" for us,
Brentwood had a too expensive price to commute into central london but super nice, Hornchurch a bit too far away from the TFL cross rail, but very nice (prices were higher over there).
My husband and I are commuting to Central London pretty much every day, the TFL cross rail takes 35 mins from Harold Wood to Liverpool Street. There are two bus lines that operate in Harold Hill and they take around 10-12 minutes to get to Harold Wood station.
By the way, it takes less than 5 minutes by car, if you are really in a rush.
The central section of the Elizabeth Line will open soon and we will be able to reach Bond Street, Paddington, Tottenam Court Road, Farringdon etc... directly! It will be easy to commute Canary Wharf (my hubby works there).
But best thing is nature! There's very nice park in Harold Hill called Dagnam Park (check it out!).
In this area there are outstanding Primary schools as well, we don't have children but we are planning to, at some point. Dunno much about the secondary school to be honest!
Neighbours is made mostly of nice old people, from what we can tell they care a lot about the community, they are helping each other out and they made us feel welcome. It was something that we really missed when living in central London.
There are not good restaurants in this area but I think this situation will improve in the next few years though (WE HOPE SO!). I have seen so many people moving from central london
to this place in the last year and I think it will be gentrified very quickly with the opening of the Elizabeth Line.
Good luck!