I booked this apartment for a 3-night stay with my wife and a friend who were on a longer holiday in the UK. We would have preferred to be in central London but, as expected, accommodations in the city are considerably more expensive and - in our experience - often much smaller or of inferior quality. We chose Stefano's and Matia's place because although it was in a London suburb, it is very convenient to London's excellent public transportation network.
When we booked our stay, Stefano and Maria were very helpful in arranging to have the keys to the apartment sent via post to my wife's aunt in Northern England so that we could pick them up when we visited her there. Stefano and Maria were extremely communicative, answering our many questions, and offering a lot of advice about available local services, transportation options, etc.
Upon our arrival, we were immediately very pleased with the size of the apartment and its cleanliness. It is very large and immaculate. And the quantity and quality of amenities were exceptional. For example, there were three different tools for making coffee! Just about anything a traveler might need was present. And although the apartment's listing on AirBnB was not specific about whether the laundry facilities were in the apartment or elsewhere in the building complex, we were pleased that, indeed, a washer and dryer are located in the unit.
[An amusing anecdote about the latter: there is a label on the dryer requesting that the water bucket be emptied after each load of laundry has been dried. We are from America and had never encountered a dryer equipped with a water bucket, but apparently in the UK - perhaps elsewhere in Europe - this is common. Rather than exhausting the heated, moisture-laden air to the outdoors, the moisture is extracted from the air and deposited in the aforementioned bucket; the air is apparently returned to the interior. I presume - but do not know - that this is to avoid wasting energy. In any case, not only were we perplexed by the instruction, we couldn't locate the water reservoir. A quick on-line inquiry to Stefano and Maria resulted in an almost-immediate response with instructions, including a photo, that clarified everything.]
Among the benefits of the apartment's location: the area is very quiet, there are many services in the immediate area and it is an easy 10-minute walk to an Underground rail station that makes it possible to get into central London in as little as 30 minutes (including the walk to the station).
In brief​: a great experience.