Booked this for my parents when they were visiting from out of town (apparently the most popular type of guest for this flat!). They had a very comfortable stay and thought the flat was stylish, particularly the lovely garden.
Brett was very communicative before and after the stay (even while travelling abroad) and gave very detailed instructions on how to work the heating, water temperature, locking up etc to maximise the enjoyment of their stay.
The location is great (about 7 minutes walk to Arsenal or Finsbury Park stations) and the flat has Sky TV and a DVD player. We didn't have to contact them during the stay, but Brett seemed to have good relations with the neighbours in terms of spare keys, guest dates etc in case there are any urgent issues.
2 points to note, which my parents stressed were not impediments to the stay at all but may be useful to know in advance for prospective guests:
1) The living room is a bit dark and doesn't have radiators so can get a bit chilly during the evenings - there are plenty of blankets and central heating throughout the house and was fine for me when I visited them, but if you're likely to spend lots of time relaxing at home in the evenings and are visiting in winter with a propensity to get cold, it might be worth bringing a small reading light and some extra warm indoor clothes/socks.
2) The back door to the garden entrance has a bit of a dodgy lock system and requires quite a lot of aggressive door slamming/yanking of the handle to lock properly. There is a technique to this and is fine (and absolutely secure) once you get the hang of it, but it takes a bit of getting used to, and particularly weaker/older guests may struggle to open this easily if they want to use the garden regularly. Brett was very quick to call and guide us through this when we messaged him for help though, even though he was abroad at time.