It was a great stay at Serena's apartment. We were 5 staying and it was perfect.
The apartment is really clean, well furnished and with clear instructions.
It is also well located just 2 or 3 minutes walk from the tube station White City on Central line (convenient to visit London).
We came by car and we find a free place to park just in the street (the parking was not too crowded when we got there).
We did not see Serena but she was extremely responsive and available for all the questions we had, and giving advise.
It is a great place to stay if you want to enjoy London and nice host also.