We went to London for 3 days as a family and Nick & Steph's flat was perfect. We enjoyed our stay there.
The apartment is very near to buses lines (1 & 78 straight to London Bridge) and the metro (10 minutes walking).
The flat corresponds to what we were expecting : 2 very nice bedrooms, 2 bathrooms (no dispute with my wife and daughters), the kitchen has everything (except maybe a microwawe) and a view on the park, very pleasant on mornings. Nick & Steph did everything and answered to our so many requests to make our stay easier. We will definitely come again.