Our family of 4 stayed at Tricia and Penny´s apartment in Highgate for 4 days. It was a lovely stay. The apartment is very cosy and well equipped. Communication was very efficient. We were lucky with the weather and were even able to enjoy the outdoor space - in October!
The apartment is on the Northern end of the city but accessible by bus, tube or cab.
Highly recommended if you´re staying in London.