The location of the place is its greatest asset - really close to central London and with plenty transport options available. The house is also really quiet, which is hard to get in an AirBnB, and the host is very responsive to messages.
That said, the house requires a lot of improvements in infrastructure and furnishing to be brought up to standard. In addition, there are several rooms for guests in the house and when these are full it becomes harder to observe house rules (such as cleanliness, locking the front door, etc) - however, this is as much a responsibility of the guests as it is of the owners.