I loved my stay in John and Caroline's place. First and foremost, they were both super friendly and accommodating. They made me feel very comfortable, and helped with many local tips. Great attention to detail and hospitality, like providing some nice breakfast food and tea, and a printed guide for using the apartment and some local places to visit.
The room itself was also very nice. Everything tidy and comfortable. Has a private bathroom and a mini fridge. And also a nice view and light, which was very helpful since I was working from there :)
Finally, the location of the apartment was very enjoyable. I loved walking in the Olympic Park, which is close by. And the neighborhood in general is very suburban and quiet, yet it has access to nice restaurants and pubs, a shopping mall nearby, and you can be on the city centre relatively fast going by bus or by underground.
Super recommended stay. If I ever go back to London, I will definitely consider staying there again.