I love Streatham and it's diversity. The house prices are getting higher so I would buy asap.
Schools are great I've just moved my daughter to the primary on my road as I fear my youngest won't get in as they are going for Outstanding and people will be renting flats next door just to get their kids in. But pretty much all the schools are doing well and we have Dunraven which is suppose to be brilliant.
We have the commons as you mentioned with kite day and the dog show and also streatham food festival is coming up. Also we have 2 farmers markets.
Canvendish lodge is oversubscribed so you would need you name down now but most nursaries are good.
Lots of resturants and bars opening up and yes we are getting a soft play and a new cafe/soft play is in the pipeline.
We're all friendly over here and hope it stays that way