We, a family of 4 with 2 teenage boys, spent 3 days in the appartment. It's a pleasant, relaxed space with high ceilings. No sounds from the neighbours. Location is super: a quiet street close to Hyde park and Kensington plus Notting Hill. The underground is some 500 meters away and takes you in minutes to Oxford street or Buckingham palace.
The appartment itself is extremely basic, the kitchen lacks a coffee machine, toaster and dishwasher. Francesca does nog provide any breakfast supplies; a good and cheap breakfast can be had elsewhere in the street. Our sons throughout the second bed to be too small.