The area is very safe; even for a female alone at night, so you don't have to worry about coming back to the Air BnB rather late.
Everything is in close proximity: the Bus, the Overground or the Tube or even an ATM in front of Morrisons (supermarket), which is 5mins away.
I felt very safe and at ease in Colette's appartment, I really appreciated her directions and tips.
One thing though: if you're a light sleeper, I'd advice you to get earplugs, since the walls are rather thin.
Overall, I'd really recommend Colette's appartment, especially for female solo travelers!