We absolutely enjoyed our stay at Kate's! Even if she wasn't home,her partner Renato showed us everything and made us feel comfy.
The house is furnished lovely, just as shown on the pictures...I appreciate Kate's sense of vintage :)
The location is in a quite neighborhood with a little Kiosk on the opposite to do your first shops (but on the way to Seven Sisters you can cross a Salisbury as well).
As described it was easy to get anywhere by tube, however Seven Sisters is already in zone 3 so if you travel by oyster card the maximum daily amount was about 7,80 Pound I think.
I recommend Kate's house!