Olivia's place is absolutely class A. Get it while you can and hope you aren't too slow; this place is worth it if you see it. She leaves the place as if it were your own home with very little left to want. Hampstead Heath is practically in her back yard and the walk to Belsize, Camden, or Hampstead is a lovely and short walk.
It can't be helped, as the place is on the street, but just like literally most places in the central London area, there is traffic and siren noise. The noise is avoided in the cozy, comfy bedroom on the top floor.
The tucked away entryway makes for a great spot for deliveries and Olivia's neighbors are considerate with bins, noise, and space.
I'd return here in an instant when I could!