Tristan and Charlotte's home is wonderful--spacious, well appointed, with all the amenities, and with a lovely garden (with hot tub) that we made good use of in the evenings. We loved the design, which has many (very tasteful but fun) animal themes given their ties to Africa. Each day I found something new to appreciate.
Ours was a mixed group of colleagues from the US and Australia who had varying degrees of familiarity at the start of the trip. The house allowed everyone to have their own space (and bathroom!) while providing several communal spaces for work-related conversation as well as socializing. It really was perfect for our journey!
Communication with Tristan and Charlotte was clear and incredibly prompt, and they were very responsive to requests. For example, there was an issue with a bedroom door handle which I mentioned to them at 10 AM, and before I came home from my work-related activities by 4 PM they had a locksmith in to fix it.
This isn't a complaint, but it was an unusually hot week in the UK, and so the house was quite warm during the day, particularly in the large solarium and lovely attached to the kitchen. As with most homes in the UK, there was no central air. With the use of fans and open windows, it was quite comfortable for sleeping. This shouldn't be an issue most times of year, but for people who don't tolerate variation in temperature well, it might be something to consider.
As the hosts have mentioned, you do need to be willing/able to walk about 10 minutes to the nearest train station or afford a cab/Uber into town. But if you are willing/able to manage covering a little distance, you'll be rewarded with a truly lovely place to spend your time and from which to explore London. We enjoyed our time in the house as much as our time in the city. I highly recommend this property!