Niki's place was perfect. It's on a lovely quiet residential street, about a 10 min walk to main roads with shops, restaurants, and cafes. We used the flat as a base and traipsed all over London. It's about 2m from central London.
The flat itself had everything you need. The only recommendation I'd make is if Niki could leave an instruction card regarding checkout: keys, trash, etc., so I didn't have to keep bothering her with questions.
She was super responsive and accommodating. I even made a mistake on the booking and she took it all in stride. Highly recommend her place.