First of all, the communication with James and Kate has been wonderful. The couple is very charming, helpful and welcoming. Secondly, the apartment is truly stunning. So tastefully decorated, spacious and located in an wonderful neighborhood with great possibilities for grocery shopping and a renowned fish and chip shop (the Seashell) close by.
My boyfriend and I went there this December with my mum and niece and the apartment suited our needs perfectly and while I wouldn't nesessarily recommend London in December unless you really like seeing a big city filled to capacity, I would definitely recommend this place all year round.