Stef's flat is great, and we had a lovely stay.
The flat itself is located in a quiet neighborhood but it has great access to the center of London. You can walk 5-6 min and get to the tube stop at St. John's Wood where you can take the Jubilee line. This fine is really fast and gets you directly into the center of London and to other good stops to transfer. The building has a center 'garden courtyard' that is a nice view and also keeps things quiet.
The apartment has two bedrooms with nice large and comfortable beds. There is plenty of space in each room and also a nice big sitting room as well as a good-sized kitchen for a 2-bedroom flat. Stef's place has all the basic amenities one needs - washing machine, dishwasher, stove, microwave, coffee machine, iron and ironing board, etc. The bathroom has a rainwater shower and we found it very clean.
I definitely recommend Stef's place to anyone visiting London looking for a nice mix of quiet neighborhood, local cafes, parks, and access to the city. Stef was very flexible with us regarding some changes we had to make; she was excellent to in her communication and was really friendly.