We were in London for 5 days and our stay in Sarah's apt was a very pleasant experience. Sarah is very friendly and even if she was not in London during our stay, she was in any case available and helpful.
The apt is as shown in the pictures, very clean and tidy and fully equipped. The area is full of shops and restaurants/pubs and the apartment is within minutes walk from Portobello and the closest underground.
We definitely reccomend Sarah's apt for your holidays in London!