Im a londoner. I know that area and others well. I really recommend you have a serious look at other areas where you could get a garden flat for that price.
Where are you working? Look at deptford new cross etc. I have moved to south east from north and it is so so much nicer here ..better parks and actually great transport and friendly people!
Kentish town is seriously des res pricey area i dont understand why you would pay all that money for a pokey place above shops on a noisy road.
In zone 2 and 3 you can gey better.
The whole of Camden is massively overpriced for such a grubby urban area. Its because its well known and also because it neighbours v expensive places like primrose hill and regents park.
But thr truth is there are many much nicer parts of london that are cheaper.