The room was cosy and well-ventilated (once you let the door and kitchen window opened). I stayed at this Airbnb for two months and experienced several days of terrible heatwaves, but I didn't have any trouble from the hot temperatures inside the house.
Because the room is on the lower ground floor and in hot summer weather, I frequently spotted crawling insects inside the room. The house cleaner, Maggie, did everything to resolve this issue but could not be helped. When other guests are using the kitchen, the room may not be well sound-proofing, especially when the washing machine is at work.
In terms of the location and accessibility to central London, the house could be your No. 1 choice. But if you are sensitive about in-house noise and overall cleanliness, I would recommend booking a studio room upstairs instead.