Everything was exactly as advertised.
On the plus side: the flat was clean, good quality furniture, very near the Liverpool St. Station and very easy to access and leave thanks to the gate codes. Also the host was very accomodating, allowing us to arrive a couple of hours before 3 pm which allowed us to leave our luggage early and start exploring London unencumbered.
On the minus side: the flat is on a first floor in the middle of The City so it was noisy quite early with traffic, people going to work and some construction work being done nearby. Another slight problem came with the shower, we were not able to change water temperature no matter how much we tried and it was set slightly hotter than my kids would have liked, but no biggie.
All in all, good value for money.